Starion/Conquest help please
Vikki
08-19-2004, 03:49 PM
Hello. I'm looking for some advice about my 1986 Plymouth Conquest (sister car Mitz Starion). Hubby has tried, but really isn't much help. Here's what it's doing:
When I'm idling, like at a stop light or driving slowly as in a parking lot, then it 'surges' . The RPM's go up to around 3K and then quickly fall back down to around 1.5 or so. It does this repeatedly, and increasingly faster, until I'm back up to speed. On two occasions it backfired. It mostly does this when it's warmed up, although sometimes it will do it when cold.
Most recently it's started not even idling down in the first place. When I push the clutch, then the RPM's (again) go up to 3K and will pretty much stay there. I can cruise at 35mph without touching the pedal. We've replaced the injectors, which were leaking. It smells better (haha) but it still didn't fix the problem. I'm told it needs a mass airflow sensor but it's a rather expensive part and so we haven't replaced that yet. Any other suggestions out there?
One more thing: It has turbo. Most of the time it works just fine, but there have been a few times that it ran very rough when the vacuum guage got up to zero. A few weeks ago I saw a thread in here that sounded just like this and the person described it as feeling like an inexperienced driver learning how to drive a stick. He apparently received some good advice and fixed his problem, but now I can't find that thread.
Does anyone know what causes these problems and how to fix them? Any suggestions would be greatly appreciated.
Thank you.
When I'm idling, like at a stop light or driving slowly as in a parking lot, then it 'surges' . The RPM's go up to around 3K and then quickly fall back down to around 1.5 or so. It does this repeatedly, and increasingly faster, until I'm back up to speed. On two occasions it backfired. It mostly does this when it's warmed up, although sometimes it will do it when cold.
Most recently it's started not even idling down in the first place. When I push the clutch, then the RPM's (again) go up to 3K and will pretty much stay there. I can cruise at 35mph without touching the pedal. We've replaced the injectors, which were leaking. It smells better (haha) but it still didn't fix the problem. I'm told it needs a mass airflow sensor but it's a rather expensive part and so we haven't replaced that yet. Any other suggestions out there?
One more thing: It has turbo. Most of the time it works just fine, but there have been a few times that it ran very rough when the vacuum guage got up to zero. A few weeks ago I saw a thread in here that sounded just like this and the person described it as feeling like an inexperienced driver learning how to drive a stick. He apparently received some good advice and fixed his problem, but now I can't find that thread.
Does anyone know what causes these problems and how to fix them? Any suggestions would be greatly appreciated.
Thank you.
96TSi
08-23-2004, 06:46 PM
on the throttle body there is a little skrew that you can move, move it till the idle gets better. you can goto the eclipse section and find that same problem with better description on how to fix the idle surge
Vikki
08-24-2004, 02:44 AM
Cool =) Thank you. I'll 'suggest' it to him.
Vikki
09-01-2004, 10:58 PM
OK....tried that and it didn't help. Does anyone else have any other ideas or suggestions?
96TSi
09-03-2004, 06:41 PM
get a big hammer :D
goto www.vfaq.com and look up idle surge for DSMs. they will have alotta info on it and it is very well explained
goto www.vfaq.com and look up idle surge for DSMs. they will have alotta info on it and it is very well explained
indy_85stariones
10-17-2004, 04:15 AM
Check ECU error codes...
Perform a TPS/ISC reset...
Follow procedures from a 1986 or older service manual. 1987 thru 1989 procedures are different.
Perform a TPS/ISC reset...
Follow procedures from a 1986 or older service manual. 1987 thru 1989 procedures are different.
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