Question about 1991 GMC Sonoma

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Running rich 2.8 litter firing order

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123456 running rich - 0258fe1f-84da-4f6f-9e79-79df9e05b99c.jpg

hope it helps

Posted on Mar 24, 2014

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Posted on Jan 02, 2017

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What cause the engine to run rich and black smoke coming from tail pipe?


hmmm sounds like the fuel pump is more of the issue as its sending too much fuel into the motor making it run rich or the gas that your using is too rich for the motor itself

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94 chevrolet s-10 blazer firing order cap and plugs diagram


The firing order is printed around the top of the motor beside the valve cover. Did you put a new distributor, rotor cap, or button In it.

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1988 chevy camaro 2.8 liter multy port fuel injecton I recenly replaced the fuel pressure regulator, but the car is still running rich, idle surging, and misfire. I appriciate your help>


check you oxygen sensor. check the timing catilitic converters could be pluged now too. running rich can be a cause from that also an efect of running rich if theres another problem. check everything else before replacing the cats becausethey arnt cheap and if ist still running rich it will burn them out. also check the firing order if its real bad u may have one switched. that will cause the cats to glow and burn out.

Nov 18, 2010 | 1988 Chevrolet Camaro

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Have a 1989 f250 5.8 that didnt pass smog the guy told me its running rich the report said the HCdidnt pass just by a few numbers everthing else passed so i put plugs cap wires o2 sensor and a new brake...


Would double check your firing order on your cap.If running worse almost positive some wires were crossed.The spark plug firing order is ( 1 - 3 - 7 - 2 - 6 - 5 - 4 - 8 ) and runs counterclockwise on the distributor cap.

Jun 01, 2010 | 1989 Ford F 250

1 Answer

Runs rich and miss fires


Make sure the spark plug wires are on right (propper firing order), and check the TPS sensor. Are there any exhaust leaks or vacuum leaks? Did you use the original intake manifolds and Holley throttle body? If not you need to replace the PROM chip with the one from the donor car.

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I have a 1991 chev truck,4.3 v6 and the plug wires got mixed up on the cap after a tuneup,I need a fireing order,Thanks Rich


the firing order is 18436572 drivers side of engine front plug is number 1 and pass front is 2

Jun 30, 2009 | 1994 Chevrolet C1500

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