Help.....3800 problem - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 06-24-2005, 12:22 AM   #11
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Clear,

Try this, take a multimeter, set it to ohm reading. On your TPS (throttle Position Sensor) unplug the lead and place one lead on pin 1 and one on pin 2 on the sensor side. Then move the throttle of your non running engine. Do it slowly and look for any dead spots. What you should see is a gradual but steady increase in resistance. If you see it increase then drop to 0 then increase again -that'* a dead spot. Replace the TPS is this occurs.
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Old 06-24-2005, 01:35 PM   #12
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If the TPS is bad, what voltage do I set it at @ idle?
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Old 06-24-2005, 04:14 PM   #13
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Checked the OHM on the TPS. It fluxuated alot, but I dont know if its bad or not. It never dropped to 0, but it would go from 12.50 right down to 12.1 or so.

Anyways, dont know if this helps.
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Old 06-24-2005, 04:28 PM   #14
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Are you checking volts or resistance? I remember my TPS going up to about 2500 ohms. My service manual is at home. You shouldn't have any voltage across it unless you haven't unplugged it, make sure you unplug it so you don't get a resistance reading from the ECM.
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Old 06-24-2005, 04:53 PM   #15
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The best way to test it is to turn the key to on, but not start the engine, so the TPS gets signal voltage. Then harpoon the wires to check the voltage.
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Old 06-24-2005, 07:17 PM   #16
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Did that,

replaced the TPS, everything is fine there.

Im going to the bank monday to get a loan for a new car. Im done ******* with this one. I'll probably try and sell it or part it out. It'* too old to put anymore cash into.
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Old 06-24-2005, 07:19 PM   #17
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Sell a car because of one problem? Only if you already want a new car to begin with, I suppose.

Still, should be an easy fix, if we could just narrow it down with a little more trouble shooting or better yet scan data.
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Old 06-24-2005, 07:23 PM   #18
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One problem? It'* been many. I have put over 2000$ into this car when I bought it less than a year ago. I love the Bonneville, but, its 15 years old, and its had its course. I've been wanting a new car, I just havent had a reason, until now. When I check for error codes, its the same **** over and over. Something is seriously wrong, and you know it when the garage says take it to another place. Oh well.
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Old 06-25-2005, 11:15 AM   #19
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sometimes scanning is masking other simptoms. Your tps voltage at idle should be 4.2-4.6 volts. I would check that first if you getting a high voltage code.
Just tap the signal and ground wires with the key on engine off with a digital voltmeter.
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Old 06-25-2005, 11:24 AM   #20
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uhh... it should be 4.6 at WOT. .70 at idle.. but we can't do that in our cars. I did it in mine, and I got a 2000RPM idle, that never went down [IAC was fully extended too].


-justin
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