Having issues with idiling
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Intermediate
Joined: Oct 2006
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Having issues with idiling
my 88 carrera is idiling funny, it bounces from 1000 rpm to 1200 rpm, and does this when its hot or cold. i already changed the idle controll unit and the problem seems to be improving, it was jumping from 1000 rpm to 200 rpm and would shut off. now it just goes upwards to about 1200. i had the throttle body cleaned, cleaned out the air filter but wondering what to do next.
maybe the distributor or wires??
thanks
maybe the distributor or wires??
thanks
Instructor
Joined: Nov 2005
Posts: 200
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From: Washington State
Very easy. Do it while the engine is cold, you may want to spray some PBlaster on it a day in advance.
Unplug it from the harness in the engine compartment.
Take off the shield and unscrew the old one and put the new one in and plug back in.
Be careful with the new one as to not drop it or beat it up or get any anti seize on it when installing.
You can save yourself some $$'s by getting a generic and splicing it into your plug.
Unplug it from the harness in the engine compartment.
Take off the shield and unscrew the old one and put the new one in and plug back in.
Be careful with the new one as to not drop it or beat it up or get any anti seize on it when installing.
You can save yourself some $$'s by getting a generic and splicing it into your plug.
Thread Starter
Intermediate
Joined: Oct 2006
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Originally Posted by J. Brinkley
I'd unplug it and the ICV and see what happens to your idle. If there's a drastic change I'd look for an air leak.
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A working o2 sensor will swing your idle somewhere between 30-60 rpms as it works. If unplugging does nothing it doesn't neccasarily mean it's bad, or good.
if it gets worse then your o2 is working, or trying to help the car run at the right mix and speed
doesn't matter if you unplug together or seperate. You're taking the fixes (o2 and icv) out of the equation and letting the car run by itself.
look at the vac diagram on the engine lid and check all the hoses
if it gets worse then your o2 is working, or trying to help the car run at the right mix and speed
doesn't matter if you unplug together or seperate. You're taking the fixes (o2 and icv) out of the equation and letting the car run by itself.
look at the vac diagram on the engine lid and check all the hoses
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Instructor
Joined: Nov 2005
Posts: 200
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From: Washington State
With the car warm and idling, remove the oil filler cap. The rpm's should drop a little, but the car should still run.
If the car smooths out with the O2 sensor unplugged, you need a new sensor. If it's already over 75k, just change it.
How many miles on the car? Last tune up, valve adjust and air and filter change?
If the car smooths out with the O2 sensor unplugged, you need a new sensor. If it's already over 75k, just change it.
How many miles on the car? Last tune up, valve adjust and air and filter change?
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Track Day
Joined: Jan 2007
Posts: 20
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From: New Jersey
To correctly set idle you need to first jump the pins on the test port so as to dissable the idle control. It is my understanding that the O2 sensor will have no effect on cold idle and very little, if no, effect on warm idle. If you need more info on the above I can probably dig up a diagram and instuctions.
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I wouldn't buy anything until I found the problem. No offense, but the 02 isn't going to fix anything. Most of the time your DME is disregarding the signal anyway. I'd get my car running right first. If it won't run well without it, it won't with it either.
but yes pelican. But there are cheaper places to buy stuff
A local store has a generic sensor that will work if you splice the wires. Having that proprietary plug on the end of it is what makes it expensive.
If you really want to get to know your car get a bosch motronic manual
but yes pelican. But there are cheaper places to buy stuff
A local store has a generic sensor that will work if you splice the wires. Having that proprietary plug on the end of it is what makes it expensive.
If you really want to get to know your car get a bosch motronic manual
Thread Starter
Intermediate
Joined: Oct 2006
Posts: 30
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Originally Posted by J. Brinkley
I wouldn't buy anything until I found the problem. No offense, but the 02 isn't going to fix anything. Most of the time your DME is disregarding the signal anyway. I'd get my car running right first. If it won't run well without it, it won't with it either.
but yes pelican. But there are cheaper places to buy stuff
A local store has a generic sensor that will work if you splice the wires. Having that proprietary plug on the end of it is what makes it expensive.
If you really want to get to know your car get a bosch motronic manual
but yes pelican. But there are cheaper places to buy stuff
A local store has a generic sensor that will work if you splice the wires. Having that proprietary plug on the end of it is what makes it expensive.
If you really want to get to know your car get a bosch motronic manual
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Joined: Jan 2002
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From: San Antonio TX
hollywood213, the easiest way to remove the O2 sensor is to jack the ledt rear of the car, put a jack stand(s) under it, remove the left rear wheel for easy access, and remove the sensor. Install is the opposite. I just did mine and used a generic Bosch sensor. I cut the wires and soldered in the new sensor. I also had a problem with idling on my 88 Carrera, but it was idling to erratically and not surging. I finally pulled the fuel rails out and had the injectors flowed and cleaned. Boy does it run good now.