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1991 truck 3VZE Help with diagnosis (Results of tests)

Old 06-24-2015, 01:51 PM
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1991 truck 3VZE Help with diagnosis (Results of tests)

I have a 1991 Toyota 4WD DLX Extended cab with the 3VZE motor. Starts fine, idles high (1600 RPM or so). After 5 minutes of driving I get major power loss and won't rev over 2500 rpm. Lasts for 2 minutes then runs fine. (Sometimes if I pump the gas it helps to resolve it quicker) Never overheats, but there is coolant loss. I think a bad radiator cap because reservoir is full but radiator is low.

Ran diagnostics. I got 3 codes: 24, 31, 41. IAT, VAF, and TPS.

TPS is bad...stuck in open position. Not sure about others.

Compression test yielded 155+ on all cylinders and they held for as long as I left tester on. (I cranked the last one a few extra and it held at 170+)

I did have a little oil pudding on fill cap but oil on dipstick looks great. Previous owner only drove it on short trips to the woods. Also, when I got it, there was a brief bit of light smoke from exhaust but after sea foam treating the gas and oil that has gone away.

Took off intake plenum and the intake gasket is new looking. Some bad looking vacuum lines

Spark plugs look good. slight pale color, all consistent. Normal wear according to chart.

Can I rule out a head gasket for now and put it back together replacing the above mentioned parts and lines or would you recommend going deeper?
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Old 07-01-2015, 06:26 PM
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I went ahead and drained the oil and it is dark brown. Other than having a bit more oil in it than it should have, it looks normal. incidentally, why have I gotten no replies? Did I do something wrong with the way I posted? I made sure to research first and post as much info as possible. Any help would be appreciated.
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Old 07-01-2015, 06:44 PM
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As long as it's not overheating and there are no apparent leaks, I wouldn't worry about the hg. Did you replace the tps?
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Old 07-01-2015, 06:48 PM
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Originally Posted by mtrdrms View Post
As long as it's not overheating and there are no apparent leaks, I wouldn't worry about the hg. Did you replace the tps?
Waiting for one to come in the mail along with a new fan. Not overheating and no leaks that I can find other than the overflow because of the cap. Okay well when I get those parts I'll slap it back together and report the results. Thanks!
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Old 01-04-2019, 08:07 PM
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Help!!!!

Originally Posted by zd92655 View Post
I have a 1991 Toyota 4WD DLX Extended cab with the 3VZE motor. Starts fine, idles high (1600 RPM or so). After 5 minutes of driving I get major power loss and won't rev over 2500 rpm. Lasts for 2 minutes then runs fine. (Sometimes if I pump the gas it helps to resolve it quicker) Never overheats, but there is coolant loss. I think a bad radiator cap because reservoir is full but radiator is low.

Ran diagnostics. I got 3 codes: 24, 31, 41. IAT, VAF, and TPS.

TPS is bad...stuck in open position. Not sure about others.

Compression test yielded 155+ on all cylinders and they held for as long as I left tester on. (I cranked the last one a few extra and it held at 170+)

I did have a little oil pudding on fill cap but oil on dipstick looks great. Previous owner only drove it on short trips to the woods. Also, when I got it, there was a brief bit of light smoke from exhaust but after sea foam treating the gas and oil that has gone away.

Took off intake plenum and the intake gasket is new looking. Some bad looking vacuum lines

Spark plugs look good. slight pale color, all consistent. Normal wear according to chart.

Can I rule out a head gasket for now and put it back together replacing the above mentioned parts and lines or would you recommend going deeper?

help!!!! I have the same exact symptoms in my rig. After two months of trying things and swapping parts I have finally found this thread. Same exact issues my truck has. Did you ever find out what the issue was?
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Old 01-05-2019, 02:13 PM
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It was the tps. It caused gas to get in the oil because it fooled the injectuin in to thinking it was wide open all the time

Last edited by zd92655; 01-05-2019 at 02:15 PM.
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