95 tahoe bucking under part throttle and no codes

[95tahoemike]

i have a 95 tahoe tbi bucking up part throttle and backfires but you go full throttle runs fine. have replaced o2 sensor and tps and i have no codes even driving it like this for a hour or longer no codes. my check engine light does work

 

[retorq]

Get a cable and scan it at home with a notebook.

 

[SunlitComet]

Ignore

 

[retorq]

ignore

lol waht?!

 

[SunlitComet]

Just found the the link for software and hardware for a PC based OBD1 system. Might need it one day. That is what I was going to ask.

 

[Ironman1979]

sounds like the timing jumped a little. under full throttle you get the electronic advance and it runs good but at no advance it backfires and bucks. drop a timing light on it. my 95 hoe i had the bearing in the dist went out and made the rotor wobble just enought that i contacted the points and pulled it off time about 3 degrees.

 

[retorq]

Might be worth checking fuel pressure too ...

Just found the the link for software and hardware for a PC based OBD1 system. Might need it one day. That is what I was going to ask.

It's a life saver for me ...

 

[JonnyTahoe]

I would say try new cap, rotor,plugs, wires and a new fuel filter. Then you can rule all that out. Plus you will get better mileage. Try taking the air cleaner off and go for a drive. see if that helps, plus it sounds cool.

 

[youknowmyname67]

check for a cracked or broken vacuum line by the egr on the back under the intake just to eliminate that also

 

[retorq]

I would say try new cap, rotor,plugs, wires and a new fuel filter. Then you can rule all that out. Plus you will get better mileage. Try taking the air cleaner off and go for a drive. see if that helps, plus it sounds cool.

Yeah I love the sound of ingesting sand into my engine.