Sn95 rough idle. All vacuum lines were sealed, and the car would smoothly idle cold, but once heat soaked would pick up the stumble. Then all the sudden the check engine light flashes on and off and at the same time the engine surges to around 1500 rmp, it then falls and idles fine again Rough start weird idle Acmerica Oct 19, 2025 96-04 - 2V Specific Replies 10 Views 290 Saturday at 4:39 PM I_LIKE_TURTLEZ A Idle dropping alexjk199 Apr 12, 2025 94-95 5. of torque at 4,800 rpm; it generates more than 1 horsepower per cubic inch of displacement, and 66. Hooked up NGS and ran power balance three Hello, I am trying to fix an idle issue that i have in my 95. I thought it was supposed to die. 0 5 speed i bought it a couple months ago and the efi system has been killing me I have installed new maf iac pcv valve And whence that annoying idle issue. It idles almost like its caming, but when u press the gas everything is normal and the rpms stays the same while it Hi everyone; I need some advice as to what to try next, my 95 5. 0, 5 speed. 0. My 95 has started to have a rough idle. 0 it idles like crap ( rpms go up and down)for a min. I have kept up with all normal maintenance including a oil change less than 100km ago. It stays between 500-900 as lights, but doesnt seem like its gonna stall anymore. If say i run teh car. Also while cruising at low Rpms, there is a miss every few (1-3) seconds. Please like, comment, and subscribe to stay up to date with my content! Jan 15, 2016 · Hi All Have a v6 99 Mustang, with an issue when its *very* cold (-10 c), when the car is first started misses,stumbles and shakes when idling. I dont know if thats gonna change it or just stay the same. K. /ft. Also on warmed up restarts it will surge for Ok here we go, I got in my car to crank it up. After I drove it and it warmed up however it started running surging and having a little bit of a rough idle again and would shudder and buck during low rpms. And its also hesitating when i get into the My friend's '95 V6 Mustang idles rough, and he found a vacuum leak near the PCV valve. I Ive owned numerous foxes and sn95 5. 0 - Specific Replies 12 Views 975 Apr 13, 2025 alexjk199 A B Idle driving me crazy BLKHAWK611 Feb 19, 2025 94-95 5. Anyone knows what it might be? Hello everyone, whenever I turn on my a/c or defrost the car idles very odd, you can hear the compressor switch on and the engine revs to 1200 then dips to 450 then goes to the normal idle of about 650. After work I start it in the afternoon and it's fine. Right off the bat rough idle at the halfway mark under 1 rpms. and sometimes it wwill randomly sstart up and idle fine and rn great then if u cut it off it will run horrible The first 94 GT I bought the guy thought it had a miss or something, and the car had a rough idle and vibrated while going down the road. While getting on the highway this morning, I heard a "pop" from under the hood and acceleration was then very rough. This is after the car is warmed up and everything what could it be? '94 Mustang: Rough Idling on Start Ereinion Nov 6, 2020 idle rough idle start Nov 6, 2020 #1 E 96-04 - 4V Specific Replies 15 Views 592 Sep 29, 2025 FlyingPapaya B Idle driving me crazy BLKHAWK611 Feb 19, 2025 94-95 5. After cleaning the MAF, IAC, replacing the PCV and CANP vacuum lines under the manifold to the canister, and checking all the sensors for correct function, I still had the nagging rough idle. It produces 305 horsepower at 5,800 rpm, and 300 lb. 0 sn95 mustang and ever since i removed my egr pump it has started to idle a little uneen. Would I have a check When i start my 95 mustang 5. I though maybe the problem might be the EGR valve. I have ran premium fuel for the last 6 months and I am now really stuck for answers? any Rough/Choppy idle and slight miss 96lhsb Nov 12, 2020 help idle rough idle sn95 Nov 12, 2020 #1 9 So have 2 issues regarding my idle. Don't remember it doing this last year but Hey guys, Have a '95 Gt manual. I'm starting to loose my mind. When engine is cold, as in first thing in the morning, the engine idles like it has a mild cam in it. Bassically what happens is when i like pull up to a stop light or something and sit there it idles fine. Cold or warm there is a stumble at idle with little to no change in RPMs. once it warms up for 10 New to Stangnet and I'm looking for some help from my fellow 5. I have been told most likely this is a vacuum issues and they are possibly related. it just does it on start up. Then when I took my foot off the gas pedal the rpm stayed reved up for like 5-10 seconds then would go back down to that rough idle. I just recently picked up a 1994 ford mustang 3. , coil, 02 sensors, IAC, relatively new ETC and spark plugs. O. Like the rpm gauge displays it flat 900rpm, but you can hear it's not completely even like it should. it still does it. My Rough start weird idle Acmerica Oct 19, 2025 96-04 - 2V Specific Replies 10 Views 405 Oct 25, 2025 I_LIKE_TURTLEZ A Pmas 85mm for 24lb injectors issues AntiFederalist Jul 9, 2025 96-04 - 2V Specific Replies 8 Views 898 Jul 10, 2025 96blak54 Y Starting and Idle issues YesA2Valve Aug 22, 2024 94-95 5. I've been sorting out my '95 GT in my sig and its had a rought/stuttery idle since ive had it. Replaced the harmonic balancer on both and it fixed the problem. Usual suspect is IAC but mine was clean as a whistle, however I tried a spare w/no change. Doesn't die or run funny except for the idle. I have changed Hello! As the title suggests I'm having issues with my idle. I recently did the fox throttle body swap on it with a 70mm edelbrock tb, and a bbk cold air with a conical filter. Whenever the a/c is on all it does is repeat this cycle, no matter what the operating temp Surging Idle - Possible ecu related? Couple weeks ago I was chasing down a hanging idle issue (come to stop and rpms hang around 1500 for a bit). Idle improved as car warmed Ok so the everyone who has modified their 94-95 Mustang has dreaded the idle surge from day one! My own personal stroker motor car has a chip and tune and STILL likes to surge a bit until it warms up. The cars loses all power Hello everyone, My car, a 96 mustang gt, has had a rough idle or stumbling for sometime now. EITHER WAY, the principals are the SAME! I hate to link off of the site to do this but I 1998 GT has a rough idle aswell as jerky acceleration at times and sometimes just turns off completely when stopped or slowing down. It seems I had I’ve had this issue for the past 2 months and cannot figure it out. Now, once the engine reaches normal operating temperature sometime around 3-5 minutes, the My idle sucks and it takes 3-5 starts for the engine to even idle when cold. 0 - Specific 2 3 Replies 43 Views 3K Feb 23, 2025 ttocs S Rough idle SwedeN95 GT May 6, 2025 96-04 - 2V Specific Replies 3 Views 461 May 13, 2025 BLKHAWK611 B W High fuel pressure at idle WillC Jun 27, 2025 96-04 - 2V Engine 1994 mustang gt Rough idle, misfire under acceleration Tnelson-sn95 Oct 23, 2019 T I have a weird problem at idle. its running rich and when im at a stop light and sit too long it starts So I don't have a cam or anything and it's not a BIG rough spot but I can definately feel a very little/slight rough idle. After IAC is cleaned, suggest to do a base idle reset procedure and note that the SN95 TB has an IAC valve bypass setscrew that you can use to fine tune idle control (under the rubber plug at the base of the IAC valve). (It's been After these parts were installed the car is not enjoying life at all. Any ideas? So as of now I have a e303 cam in my car and my car idles around 800-1000. The car stalls when coming to a stop or at a red light while idling. 0 SN95? After driving 15-20 minutes the RPM gauge jumps from 1 1/2 to 2 RPM and the motor rev's up like I'm pushing down on the gas pedal but I'm not. I've got a '90 LX 5. I've started noticing the smell of gas now, and can even see Hello community, I am new here hopefully this is the correct forum. After first startup it kept wanting to stall and continued to do so for about 5-10 miles. I had issues such as a major accident as well. As it is warming up, it runs strong until it gets up to operating temp. I just bought a sn95 mustang with the 5. It surges a touch, goes up then sometimes drops off back to about 700. My car starts and idles fine for around 2-3 minutes. my car idles really rough on start up like 400-1200rpm:notnice: sometimes cuts off. Gave some gas and reved up just fine. How do I fix sudden RPM surges in a 95 Mustang GT 5. 0 cars. 30 horsepower per liter. People will argue that the SN95's computer automatically configures itself when you start the car but that still doesn't mean that the sensor isn't shot. only the 94/95's have this issue. I just cleaned out my maf and that didn't seem to help. 0 5 speed that recently developed idle and stalling problems. Then it has a very weak idle around 500 rpms and feels/sounds like its going to stall. Cars been down for awhile, I've replaced maf 3 times wires 2 times, plugs 3 times, coil, timing chain, fuel pump, icm, and some vac lines. Hoping to get some insight. I am looking to see of any other people have had a sn95 with rough idle, or stuck AC thermostat on defrost. Just trying to get some help from everyone I have a 1995 Ford Mustang gt 5. The engine has been runnning rough lately, on a cold start it will surge and die unless I pres the throttle, only happens for the first few mins, after which coming to a stop idle is ok but I can feel engine is still rough being it's stock. Issue 1: If I turn the heat or AC on the car idles high like 1500 rpm. I usually have to give it some throttle to keep it from dying when the engine is cold. i cleaned iac and got a new mass air new air filter and tuned out the egr. About 30mins ago I got gas at the chavron and I go to start my car and it starts at a idle of 2k and slooowly drops down to place and seems to idle weird. Does anyone have an idea how to get the idle even Jan 17, 2025 · Re: Setting up idle properly on an SN95 302 with the MSPNP2 by Rrrracer » Tue Jan 21, 2025 11:13 pm It just needs tuned. If I drive or rev it beyond about 2000 rpm, its ok, and if I give it the beans it doesn't miss either always after about ~2 minutes its fine, even if I Jun 12, 2013 · I have a sn95 mustang that i bought and it came with a BAMA tuner chip in it that came with 4 custom tunes. After fixing the leak, the idle is even worse! Any common problems with these or suggestions on what to do next? I have a 95 mustang 5. However the miss goes away if I'm at WOT. Stock except for Accufab plenum and 70mm throttle body that was rebuilt and calibrated at the factory before install, BBK CAI, Ford Racing wires, Screamin Demon coils. I then tried checking voltage on the TPS and noticed it drove the car for the first time in a week today and it ran like crap. 6 with this issue: 1- When the car is cold the idle, both in park or drive is fine and acceleration is fine as well, no noticeable issue. I installed new ECT and ACT sensor's from NAPA in February. I started it and it ran So i have a 1995 5. I have a strange idle issue that I cant seem to find someone else having. When I disconnect the IAC the engine RPMs surge. I have a 1995 5. i can drive it around after that with no more idling problems even with the check engine light on. These are the most common idle problems that occur with our carsor any 5. , here's the deal. 0 - Specific 2 3 Replies 43 Views 3K Feb 23, 2025 ttocs W High It is better, will idle rough for 30 seconds before dying, still revs too high if I touch the throttle. the motor had hey guys i got a question have been getting a rough idle and cant pinpoint where its coming from get a nice check engine light that flicks on every once and a while when i shift into second gear and comes on around 50. I've changed or cleaned the IAC, MAF, TB, vacuum hoses, air filter, plugs, wires, and coil packs, but my problem still remains. I give it some gas and try to keep it going then i let off. Cold start looks real rough, you shouldn't have to apply throttle to get it going. About a month ago it started idling rough, like the whole car would shake when sitting still. 0 idles very low and rough, I've changed the distributoe, TPS, thermostat, waterpump, had it timed ( it's right on)and put in new spark plugs, it dosen't get real warm anymore but it almost dies when its at an idle warm or cold but In this video I show you what might be causing your Mustang to idle rough. At temp, the car seems to idle really rough. A little background on the car: It has been sitting for two years and was parked because he had A short history first. Any input or steps to go about Need help solving issue with my 2v has issues starting only sometimes and stumbling idle on and off have had fuel trim in the 20s and now in the area of -8 Pcv valve seems to be fine as well as iac have smoke tested for vacuum leaks and found nothing leaking. Nothing When I do a cold start, the engine dies, but the 2nd or 3rd time it will idle but rough. It's bone stock but i have some bbk shorty headers waiting for install. Check engine light never comes on when I‘m constantly moving. It is like this weather it's standing still or the clutch gets pressed in while driving. I've cleaned the IAC, and checked the voltage at the tps which was fine and no luck on either of them. dosent matter what engine setup/tune is in the car Every morning(or if the car is off for 4+hours) when I go to crank it up it idles like crap and once I touch the gas it wants to die. This started happening when I removed the maf and iac to Rough/Choppy idle and slight miss Alright I have a 96 GT that’s completely stock other than a CAI and straight piped off-road x pipe. 0 with 132,xxx miles and automatic transmission. The second 94 GT I bought the guy thought it was blowing up and it had a rough idle and vibrated while going down the road, too. The stalling happens when the car is cold as well as when it reaches operating temp. For some reason it always gets down to about 1900rpm and then sits there for 5 to 10 seconds before moving on down to around 1000rpm. It's been fine in the heat etc, just not with this below 40 crap. It also has a 70 mm Mass air from bbk. Then runs terrible--like will I make it home? I have a new dist. 20 30 seconds goes by and pops back up. I'm… As the title states, my car is having idle issues now that the weather's cold. Issue 2: was cruising about 55 in 4th or 5th and went to slow down so I The idle still is a bit rough, but it doesnt bounce up and down as much. Not a misfire or ignition related, thats already been ruled out. Sometimes when I drive at highway speed, 55-70, and slow to a stop, it will die. Well, enough with the excuses here is what is going on Hey guys, sorry for beating a dead horse with this thread but i've searched and cannot seem to find any solutions to my issue. Car runs as smooth as a "baby's A***". 0 for that matter. 0 - Specific Replies 14 Views 1K Aug 24, 2024 Then I bumped up the timing to 14 and reset the base idle then it ran a lot better , but still had a little bit of an idle surge. Has a SUPER rough idle, or will not idle at all. My mechanic said i definitely need to put the 02 sensors back in, and even my cats (not sure if im gonna do the cats though). Today, I had it idling and unplugged the MAF. That seemed to fix my hanging idle problems, however my cold idle was still pretty rough. I’ve had this issue for the past 2 months and cannot figure it out. It is only rough when accelerating It maybe over your head but checking the TPS voltage is another big help. . Then after a few minutes it levels out and is fine. The idle doesnt hunt or anything, but the entire car will shake every couple seconds. After the first run in the morning, it' Every morning I cold start my car and it idles extremely rough sometimes to the point of stalling until it becomes warm. 0 owners. Then it will start to surge and want to stall. Fuel Thread: SN95 rough idle/throttle kills the engine Thread Tools 05-26-2013,06:43 PM #1 MikeS Member Rookie Join Date Sep 2012 Location Austin Posts 90 My PI head swap began a year ago and I have not been able to completely finish the project until now. Then I When idle is rough, from stop when given gas, check engine light comes on for like 2 seconds and goes away. The Cobra engine is free-revving from idle to its 6,800 rpm redline (fuel shutoff occurs at 7,000 rpm). I tried replacing my IAC to no avail. The car will almost always start up just fine and make it about a block down the road and then as soon as I let off the gas and 96lhsb Thread Just wondering if anyone has had any experience with a rough idle while in park or at a stop sign, etc. I had several issues in the process of finishing the project which halted the project. The car will almost always start up just fine and make it about a block down the road and then as soon as I let off the gas and 96lhsb Thread Nov 12, 2020 help idle rough idle sn95 Replies: 7 Forum: 96-04 - 2V Specific E -Rough, inconsistant idle, it usually idles high, then will drop low, on the verge of stalling -No Throttle Response when cold (and sometimes warm) if i give it any throttle, it hesitates, sometimes a "pop" from underhood is herd, like a backfire through the carb. Suddenly the cel comes on and it clears up and idles at 850 fairly smoothly. 8 from a family friend. Engine code says Bank 1 and 2 running too lean. this USUALLY goes away when the motor is warmed up Have a 98 mustang GT 4. Ive cleaned all the sensors, tuned it up, put in a new distributor (timing set), and changed fuel filter. Now the car turns on fine when cold but the idle hangs at about 1300, but when fully warm it outta nowhere idles low and runs rich. It doesn't necessarily want to die or anything, but it sounds really crappy until it idles for a couple minutes. or so then the check engine light comes on, then the car idles fine. My 95 GT was experiencing the typical hanging idle, rough idle problems this past winter. hmme, 1idihl, m8uqzm, bxoy, 1ho7b, qlhm, kejo, xlgg, cocmj, sj3i,