High idle - TPS or ECM?
#21
07-12-2011, 11:15 AM
Still having a problem. I replaced the TPS and no change. So far I have replaced the IACV, TPS, MAF, ECT and tested the O2 sensors. The ECM has been opened and inspected. Nothing visible there. No bad grounds. All have been inspected, found clean but removed and cleaned anyway. No intake leaks. My next thought is the ECM...any thoughts?
#22
07-12-2011, 01:02 PM
Baja
Join Date: Mar 2010
Location: Pittsburgh PA suburbs.
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Thank you for posting the pictures of the ECU.
I've taken a good look at the pics and haven't seen any problems.
Still... My '99 auto was having similar problems and it came down to a faulty solder joint inside the ECU, I had to use a loupe to see it.
You have changed the ECU and the problem persist so I'd start with the easy stuff first: check all the grounds you can get at. If resistence is encountered at the ground, the sensors will act up. I use special antivibration washers and dielectric paste (I used to hace a FIAT X1/9, I know about electrical gremlins).
An easy way to test a ground post is to connect a voltmeter between the Neg. batt post and the suspected ground wire. Contact resistance is proportional with load so measure voltage with load ON.
I've said before and i'm saying it again: I made a lot of money fixing electrical problems during university (1- bad contacts [crimps], 2- bad ground [rust], 3- bad wires [idiots using pins into the wire for continuity check])
SD
I've taken a good look at the pics and haven't seen any problems.
Still... My '99 auto was having similar problems and it came down to a faulty solder joint inside the ECU, I had to use a loupe to see it.
You have changed the ECU and the problem persist so I'd start with the easy stuff first: check all the grounds you can get at. If resistence is encountered at the ground, the sensors will act up. I use special antivibration washers and dielectric paste (I used to hace a FIAT X1/9, I know about electrical gremlins).
An easy way to test a ground post is to connect a voltmeter between the Neg. batt post and the suspected ground wire. Contact resistance is proportional with load so measure voltage with load ON.
I've said before and i'm saying it again: I made a lot of money fixing electrical problems during university (1- bad contacts [crimps], 2- bad ground [rust], 3- bad wires [idiots using pins into the wire for continuity check])
SD
With my window ECU, I had to push on the component leads for the cracked solder joints to be noticeable to the naked eye. Casual observation did not show them, detailed inspection found 3 cracked solder joints, so I basically reflowed all the solder joints on the bvoard. I have yet open my ECU, but now I want to check it out. Also may relocate it to inside the vehicle for better water protection.
#24
07-14-2011, 10:43 AM
#25
07-14-2011, 11:59 AM
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