Backfires

VANESSA HINES

MEMBER
1994 CHEVROLET SILVERADO
4.3L
V6
2WD
AUTOMATIC
270,000 MILES

When I put it in gear and when I push on the gas it bogs down and backfires. I have replaced throttle position sensor, spark plugs, distributor cap, pick up coil and the fuel filter. I cleaned the EGR valve and the IAC valve and it still runs bad. Any help would be appreciated.

4 Replies

HMAC300

MECHANIC
48,601 POSTS

Scan for codes cross A&B on aldl turn key on and seeif any codes are present. Check compression maybe low on that on one or two cylinders.

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Monday, May 9th, 2016 AT 9:32 AM

VANESSA HINES

MEMBER
3 POSTS

I can't do any code because it's a 94

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Monday, May 9th, 2016 AT 7:41 PM

VANESSA HINES

MEMBER
3 POSTS

I'm getting low on money and can't keep replacing parts that don't fix i. Someone please help me

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Wednesday, May 11th, 2016 AT 4:32 AM

KEN L

MASTER CERTIFIED MECHANIC
47,513 POSTS

Hi VANESSA,

Here is the guide on how to get codes,

https://www.2carpros.com/articles/buick-cadillac-chevy-gmc-oldsmobile-pontiac-gm-1983-1995-obd1-code-definitions-and-retrieval-method

Next I would check the fuel pressure, does the engine have a carb? If so check the accelerator pump wiht the engine off, look down inside the carb with a flashlight and you should see two small streams of fuel go into the engine as the throttle has opened.

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Wednesday, May 11th, 2016 AT 6:11 PM