l98 Idle Problems
Thread Starter
Heel & Toe
Joined: Dec 2007
Posts: 15
Likes: 0
From: Lanexa VA
l98 Idle Problems
I tried to install a kit that turns my fan on at 195 and accedentally hooked it up to the hot wire (Red/Black), instead of the trigger wire (Green/White). Of course this blew my fan relay and I dont know the damage from there. For some reason after it happened the car will not idle. I checked the engine code and it says 34 which is MAF. I replaced the MAF, both MAF relays, TPS, both fan relays, and it still will not idle. The car starts and runs fine if you hold your foot on it but as soon as you let off, it dies. Does anyone know anything about what might be wrong? Its a stock 87 with the 4+3.
Intermediate
Joined: Jun 2008
Posts: 49
Likes: 0
From: Schwarzenau / Austria
Sounds like the idle air valve is fully closed and not working anymore.
But in this case the car should still run on the base rpm of 450 if the throttle plate adjusting screw is on the correct (factory) setting and all other parts around are working fine.
But in this case the car should still run on the base rpm of 450 if the throttle plate adjusting screw is on the correct (factory) setting and all other parts around are working fine.
Safety Car
Joined: Oct 2007
Posts: 3,816
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From: :45 minutes from everywhere / E-I-E-I-O
I don't think the IAC is the problem.
Apparently the MAF and the fan are on the same circuit. I started my '94 the other day with the MAF connector disconnected, and another connector on the air intake hose disconnected.
It started and ran rough. ALSO, the fan came on immediately
. So they are operationally related. I powered down, cleared the computer, and plugged in the 2 sensors, and fired it up without a hitch (and the fan didn't come on, which it shouldn't have then).
Are you sure your fan relay is toast? I'm guessin' that you only cooked a ground, which is common to the MAF and the fan.
ed.: It could NOT be a common ground that links them, since when the MAF connector is NOT connected, the fan DOES come on....
Apparently the MAF and the fan are on the same circuit. I started my '94 the other day with the MAF connector disconnected, and another connector on the air intake hose disconnected.
It started and ran rough. ALSO, the fan came on immediately
. So they are operationally related. I powered down, cleared the computer, and plugged in the 2 sensors, and fired it up without a hitch (and the fan didn't come on, which it shouldn't have then).Are you sure your fan relay is toast? I'm guessin' that you only cooked a ground, which is common to the MAF and the fan.
ed.: It could NOT be a common ground that links them, since when the MAF connector is NOT connected, the fan DOES come on....
Last edited by schrade; Jun 4, 2008 at 12:32 PM.
Racer
Joined: Dec 2006
Posts: 292
Likes: 0
I tried to install a kit that turns my fan on at 195 and accedentally hooked it up to the hot wire (Red/Black), instead of the trigger wire (Green/White). Of course this blew my fan relay and I dont know the damage from there. For some reason after it happened the car will not idle. I checked the engine code and it says 34 which is MAF. I replaced the MAF, both MAF relays, TPS, both fan relays, and it still will not idle. The car starts and runs fine if you hold your foot on it but as soon as you let off, it dies. Does anyone know anything about what might be wrong? Its a stock 87 with the 4+3.
Team Owner
Joined: Jan 2003
Posts: 20,315
Likes: 245
From: Summerland B.C. Canada
Thread Starter
Heel & Toe
Joined: Dec 2007
Posts: 15
Likes: 0
From: Lanexa VA
It was the IAC. I replaced it and she runs like a dream. It is a good thing I did replace it because in the process I found out that the little U shaped coolant bypass hose that goes from the throttle body to the intake manifold was leaking. That would have left me on the side of the road, so double thanks!
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