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Hard to start and backfiring and running rough when it does start

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Bad timing chain causes this

Posted on Mar 17, 2011

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Sounds like the engine timing is off or the firing order is wrong

Posted on Mar 17, 2011

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My 99 Cougar starts. When you get it up to 2000rpms it shuts down and is hard to keep started after that. Any ideas what could cause this?


might be a fuel supply problem, as the engine runs faster it needs more fuel and more air to combust it, if sufficient is not being supplied then the engine cannot run any faster. You probably need the services of a competent mechanic. Does it run smoothly at idle or is it rough. If it is rough this might indicate that there is also another issue. backfiring indicates a fuel/air mixture mixture problem.
Acarb/timing man should sort it.

It is also worthwhile doing the standard things like checking plug leads/ distributor.

May 30, 2015 | 1999 Mercury Cougar

3 Answers

My '89 Chevy G20 350ci (5.7l) TBI Has a hard starting problem in the morning . Ive heard a MAF sensor can cause this or is it fuel related ? Thanks .


MAF sensors can cause the engine to run rough, have no power, etc. I had a Blazer that didn't run right on start up. It would backfire and run rough until it warmed up, but still never ran good. MAF stands for mass air flow and if it tells the computer the wrong airflow, the computer will mis-judge the amount of fuel to add. On the other hand, if it won't start at all it could be the fuel!

Apr 01, 2015 | 1989 Chevrolet G20

1 Answer

Backfires and runs rough when letting up on gas.


the pulse timing ring in the distributor have it checked , the metal ring is held in place with platic studs and these studs get worn, then the ring starts to move. Also check the EGR valve

Jan 28, 2013 | 1992 Dodge Dakota

1 Answer

95 chevy 1500 pops and backfires doesn't want to shift into overdrive when cold when it does the truck runs real rough


Have you checked the fuel pressure under a load, low pressure will cause these symptoms. The test port is on the top of the engine in the fuel supply rail to the fuel injectors, the fuel pressure test port looks like a large tire fill valve. You will need a fuel pressure test gauge to do this test (about $20), the pressure must be watched while you accelerate, it should never go down on hard acceleration just up about 6-8 PSI

Mar 14, 2012 | 1995 Chevrolet K1500

1 Answer

HEVROLET BLAZER 2000 MISFIRING


Timing is off,problem with timing chain,also check fluids in ******,plus also if you have a distributer in your vehicle,if it is cracked,moisture getting in and ruining the points,-that is if your vehicle has a distributer! This will make a vehicle run rough as well.
You can have new plugs put in,but if your spark plug wires are cracked or worn,this will also creat misfire and backfiring.

Jan 25, 2012 | 2000 Chevrolet Blazer

1 Answer

1999 GMC Yukon seems to backfire once in a while


look for vac leak at egr valve, when cold spray carb cleaner on and see if it speeds up the eng

Jun 27, 2009 | 1999 GMC Yukon Denali

1 Answer

95 jeep grand cherokee, hard starting, backfires, when cold


get a couple bottles of gas line antifreeze .. if you don't already use it and add it to the gas.

Robert

P.S. in minus 40 i don't even get out of bed... minus 23 here last nite... isn't winter grand

Jan 21, 2009 | 1995 Jeep Grand Cherokee

1 Answer

Kia problem


You should get the codes checked and start from there. My Kia Sportage was also backfiring and running rough, after checking the codes. It had misfires on two cylinders. I did a tune up and had to replace one of the ignition coils. Now it runs great!

Jan 01, 2009 | 2001 Kia Sportage

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