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98 mustang idle problems. 6L Mustang idle problems - Has any one had a problem with a 4. 6 with this issue: 1- When the car is cold the idle in park and in drive is fine and vehicle accelerates with no issues. The main problem I'm having is the rpms take their sweet For a year I've been searching, poking, troubleshooting and bothering a lot of people on this board (thanks for all your help) on a code 32 (evp, egr valve problem) This is where it gets Interesting. but sort of drifts back down to idle taking maybe 5-6 second to get back to idle? where as in all of my Chevy's (new Ford ownder here, be gentle), i can do the same little goose I know this has come up before with the high Idle, it is now happening to meWhen I come to a stop the Idle will hang at about 1500, If I tap the throttle it comes down, but will go back up and down. Greetings, I am a new mustang owner and here is my situation. The problem I have is beginning to worsen and lose more power when accelerating, it sputters and jerks and eventually accelerates. Recently the the engine started idleing around 1600 - 2600RPM. 8L the engine stumbles in idle (RPM are not erratic, constant 800 rpm). I missed catching the random high revs, but caught the tail end of it as the RPMs were returning to idle. Driven with authority, but not abused. Sometimes when I stop the idle will just continue to rev Greetings all, I'm new to the forum and have a question that I hope someone has encountered before. Modular V8 (4. it should idle between 700 - 800 RPM. i have a jms chip on the car. In this article, we’ll look at some of the most common causes of a SURGING IDLE / NO IDLE CHECKLIST FOR 1996–1998 MUSTANG GT (4. seems like when i come to a stop, it's dipping really low sometimes. To Have a 98 mustang GT 4. I did not realize it before but while car is in park and I rev it up it seems to stay there for a sec and then eases it self down real slow and I already took my Hello I have a 98 mustang gt. It will then drop down to the normal 800 - 1200 idle RPM and 1998 Mustang GT idle surge and base idle reset - Day 1 MustangMedic 158K subscribers 74 It will appear to stick when I'm driving and only become unstuck if I rev the car to 6K. I will go to shift and between shifts the idle is stuck at 2200 rpms. Normal Idle is around 900-1200, but occasionally mine Idles at 2000-3000. 94 - . 6L where the idle does not drop while pressing the clutch to shift with your foot off the gas? It takes about 20 - . I think tomorrow I'll put a meter on the harness in the trunk to see if I As some may have seen in my post on "the welcome wagon" thread, I referenced some idle issues I've been having with my C head 98 Cobra. 6 automatic. This is an intermittent issue, making things more difficult to My idle is stuck at 2300rpms. When acceleration between 1000 and 2000 Reset the TPS base idle and set the voltage between . When I gear down and come to a stop, the idle will be stuck between 1200-1800 rpms. Address that leak before you do anything else with the car and see what happens. 1998 mustang v6 3. etc. The Tps is reading the correct voltage, the Iac and throttle body has been cleaned, all the hoses 94-98 Mustang Owner & Lovers Santiago MartinezFeb 26, 2025 1997 cobra starts up but won’t idle and jsut dies unless I give it gas new fuel pump even with the maf unplugged http://www. 4L) - 4. 98. While idling I'm at 35psi, but when it surges I can see the pressure dropping around mid 20s and then shoots back up. It started this afternoon while driving in traffic. The Idle RPM is way too high. hey, i have been noticing my tach needle acting funny lately. AutoBodyMen. 6L, 5. I have a 95' with a high idle (1700 rpm), hooked up the OBD and it said TPC had a voltage problem, My 3rd post now, 1998 mustang GT 4. . could that be the problem? what have Hello all, just bought a 98 Cobra When I get off the gas heading up to a stop, my car stays at high idle like around 1800 or so for a few seconds then Slowly goes down to the correct idle The same thing My 98 Cobra's having some Idle issues. I checked the Throttle-body for sticking/open, nope I tried the Accel cables, nope I tried the IAC, cleaned it. nothing reset the Hello, I have a 98 Cobra with 27K miles. While driving it doesn't want to return to idle, say I'm cruising at 1500 rpm and put the car in neutral, the rpm will jump up to 2000 and stay there until I come to a complete stop or put it back in If you own a Ford Mustang and it’s idling rough, you may be feeling frustrated. With a false reading the computer is going to set the air/fuel mixture incorrectly hence a possible bad idle. While RPM's go up to 1500 or so. com / autobodymen Our channel takes you through the step by step processes of restoration of Mustangs. What Oh the irony, my 98 cobra (65000 w/rebuilt motor 20 miles) does the same thing sometimes. But sputters again in high gear. This should eliminate a hunting idle and depending on the cam profile,. 6L 2V) This checklist follows the same logic as the Fox checklist: eliminate problems step by step instead of Every thread I read lead back to the IAC when I had starting problems and an odd idle. I bump the gas pedal As some may have seen in my post on "the welcome wagon" thread, I referenced some idle issues I've been having with my C head 98 Cobra. - YouTube Here's a link to a video of part of what it's doing. But, once the engine reaches normal operating temperature the 98 Mustang GT stalling problems. The main problem I'm having is the rpms take My 98 v6 mustang just recently started surging, it has new plugs, plug wires, and ignition coil.