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90 BII Engine trouble


uscg10

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I have a 90 BII with a 2.9. I have changed plugs,wires,dist.cap, and have also cleaned the intake and idle air control. It has some power on cool mornings but on hot days no power, surges, and back fires out of the intake. Any help would be great. thanks
 


Earl43P

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adsm08

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Shot O2 sensor is always a good suspect for no power and back fires.
 
4.0B2

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No codes?
 
adsm08

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My O2 sensor fell apart and didn't set a code. The early systems are pretty crappy.
 
4.0B2

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Yeah I know but just thought I'd refresh his memory incase there is one, or I've had tikes to where my engine light never came on yet I had fresh codes. So it never hurts to check.
 
Shran

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Backfiring out of the intake indicates a timing issue to me.
 
adsm08

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Aren't timing-related backfires usually worse when the engine is cold though?
 
4.0B2

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adsm08 said:
Aren't timing-related backfires usually worse when the engine is cold though?
Click to expand...
i thought so to... but heck, you never know with the demons inside the motors sometimes...
 
Shran

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adsm08 said:
Aren't timing-related backfires usually worse when the engine is cold though?
Click to expand...
I guess it just depends on how much the timing is off and if it advances or not. Either way it's not firing when it should.
 
4.0B2

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Yeah.. So check timing. That makes sense. Lol. I'm not used to that anymore since the swap... Lol.

Also any sensor. Mainly o2, coolant temp, or tps... Hmm idk..
 

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adsm08 said:
Aren't timing-related backfires usually worse when the engine is cold though?
Click to expand...
Depends on if the TFI module is good or bad. When they fail? Normally they are good until they get up to temp--and then it can't regulate the timing as well as it should.
 

uscg10

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Haven't checked the codes. Thought it may be a timing issue. Will also check out the TFI module. Also am going to check the intake for any leaks. Will post my results and thanks for the input. Anymore ideas appreciated.
 

uscg10

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well took my truck to the shop and like always they couldn't tell me anything. Said the timing was good but couldn't get any codes off of it. Any help. Need to get this thing running.
 
4.0B2

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idk without seeing it in person really... if you were closer i'd help ya out some.
 
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