I can't get my truck to run. Engine light says Mass air flow sensor or oxygen sensor. I've now put three mass air flow sensors and a new ogxegn sensor new EGR, the engine is new and it still isn't running. Light doesn't come on when cold but will after about 2 minutes of driving it. Does anyone have any suggestions?
1989 Toyota 4×4 truck
- Thread starter jst1dab
- Start date
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does it run or doesn't it?
if youve thrown parts at it and its throwing the same codes, you likely have wiring issues.
what EXACTLY is it doing or not doing that its supposed to be doing?
who rebuilt it? who installed it?
if youve thrown parts at it and its throwing the same codes, you likely have wiring issues.
what EXACTLY is it doing or not doing that its supposed to be doing?
who rebuilt it? who installed it?
3.0 V6 or 22re?
not run at all?
spits and sputters?
crank up ok?
non-functioning fuel pump causing lean issues? what is your fuel pressure when cranking and/or runnig?
all engine grounds connected and clean?
not run at all?
spits and sputters?
crank up ok?
non-functioning fuel pump causing lean issues? what is your fuel pressure when cranking and/or runnig?
all engine grounds connected and clean?
I know people tend to call an air flow meter (AFM) a mass air flow sensor (MAF) so I will assume it has an AFM based on the year. They aren't very easy to come by these days, where did you get 3 of them to try?
Anyway, I'm with Gnob on this one. Sounds like a wiring issue. It probably runs for a few minutes because it is in open loop, then it warms up and tries to rely on sensors.
Anyway, I'm with Gnob on this one. Sounds like a wiring issue. It probably runs for a few minutes because it is in open loop, then it warms up and tries to rely on sensors.
- Thread starter
- #5
Engine is strong, won't idle, showed symptoms of the mass air flow sensor being bad but there's no way after the third one. Drove the truck for 3500 miles after new engine with no problems. Could it be a partial plugged cataloyc converter?
- Thread starter
- #7
Ill have it checked out as it's in the shop right now
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- #8
Nope all of that checked out to be good. This truck still has original catalytic converter and muffler and the truck was driven for a long time on five cyclenders. Is it possible that the catalytic converter could be plugged cause it to not breathe correctly causing these issues?
Is this issue just recent? After engine rebuilt? check all your vacuum lines and try disconnecting the EGR vacuum source.
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- #11
Yes after engine rebuild. I'm at a complete loss as to what to do. Short of replacing the wiring harness and fuse relays all other components have been replaced. New EGR valve and Mass air flow sensor. 😳😳😳😢
Did you return this to the shop who did the work? They missed something for sure. I bet you it's something simple, check the basics like timing etc.
If it’s a 22RE with any symptom like that the first place I would always check is TPS. Then I would move onto timing etc….. TPS can make you chase all kinds of things.
What if you just open the throttle a little bit? Have you tried manually adjusting the idle? If so, how does it run like that?
TPS adjustment is a good idea. Engine should usually be able to run in a closed loop mode even if there's problems.
TPS adjustment is a good idea. Engine should usually be able to run in a closed loop mode even if there's problems.
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- #15
Yeah they've looked and re-looked and had another shop also look. But now I'm broke again so it's just going to have to sit now 😳😢
This sucks, do you have a vacuum gauge and a timing light? Also a compression gauge set would be nice. Let's just start with basics first and go from there.
Very important
