Question about 1993 GMC Sonoma Club

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Engine running to rich

Smell of fuel and backfire

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An engine running rich can be caused by many factors including the need to change plug wires, distributor cap, rotor, spark plugs.
if you want to know what happened i think you should buy a tool to read the fault code, if you need click here: OBDII Code Scanner

Posted on Nov 09, 2012

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1988 buick Century backfires so hard it blows the muffler apart?


A backfire in the exhaust system is usually the result of a rich mixture ( too much fuel ) being supplied to the engine. It can also be a result of a timing/ignition problem. Does the vehicle run ok at idle? Is the check engine light on? If so, have the codes scanned for any problem areas that may be causing a rich mixture

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I got my carburetor problem fixed but now it runs for a while then starts backfiring it'll shut off let's set for a couple seconds and start right back up can anybody tell me why


That sounds like a fuel/air mixture problem.

Just to confirm .. it is a carburettor, not fuel injection?

As a general rule of thumb (with carburettors..) if it backfires through the exhaust/muffler .. the fuel mixture is too rich.

If it backfires through the carb/air filter, the mixture is too weak.

It could also be a 'sticking' float in the carb.

When an engine is cold the fuel is rich .. lots of fuel .. that's how a choke works.. However, when the engine warms up a rich mixture causes problems. The car may splutter and stall, run sluggish or cut out.

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1 Answer

Won,t start new plugs & wires


Dirty or damaged mass air flow sensor ! Disconnect the sensor an see if it will keep running . Also check the fuel pressure regulator for leaking . What make , model an year vehicle , size engine ?

Dec 18, 2015 | Cars & Trucks

1 Answer

My 99 dodge ram 4x4 is running rough and ocassionaly backfiring. it's also running very rich. my mechanic couldn't find any codes but he said the fuel pressure was low. any ideas before I drop a mint on...


if it is running rich I doubt its a fuel problem. I would check the computer temp sensor this tells the engine to lean the fuel back once the engine reaches operating temp. There should be a separate sensor for the gauge.

Oct 13, 2014 | Cars & Trucks

1 Answer

My 1995 trans am is running rich, barely wants to idle.


a tune up will be appropriate like spark plugs,cap rotor,clean throttle body,fuel filter, let try that first and look for PCM code
hope it helps

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1 Answer

Hi I'm new to this site , I have been asked to close Q I have asked already but don't know how on my iPhone to close then please help


There are two kinds of backfires, one is produced from the engine air intake and the other is produced from the tail pipe of the exhaust system. The cause for a backfire condition can vary depending on the malfunction of a particular system. Some backfires can be extreme enough to cause damage to related components. Anytime a backfire is observed immediately diagnose and repair as needed. If the engine is running rough it can produce a backfire. A backfire occurs when there is an imbalance in the air to fuel ratio required for your vehicle to operate properly. If the fuel mixture is too lean (not enough fuel) you may have a backfire in the intake manifold gasket, or too rich (too much fuel) you may get a backfire out of the exhaust system. It is important to observe the location of the backfire.

Oct 10, 2012 | Cars & Trucks

1 Answer

93' chevy 4.3 V6 vortec. engine problem


fuel lines inside the intake plhenum may be cracked and leaking inside the plhenum. same thing happened to my 1992.sonoma. they are made of a plastic material and tend to crack right in the bend of these lines.

Mar 18, 2010 | Chevrolet S 10 Cars & Trucks

2 Answers

Running rich, smelling rich


You may have a bad fuel injector or in need of a tune up badly. The early fuel injection (throttle body) had a single fuel injector that would clog and not spray fuel in a mist but would dump fuel. Does it run rough at idle? That is a good indicator. Some are rebuildable but I would suggest replacement. If you have not had a tune up in a while that should be done too.

Jan 24, 2010 | 1994 Pontiac Grand Prix

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