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Backfires and chugs put new plugs and wires in

When heavy accelerate its fine till 40 then motor feels like its going to fall out of car

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  • Cars & Trucks Master
  • 1,727 Answers

Did you check the plug gap?
did you route the wires correctly?
did you do something else during the repair causing more issues ???

Posted on Dec 28, 2013

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Posted on Jan 02, 2017

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udesh99
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SOURCE: Backfires in manifold on motor on acceleration. runs ok low speeds

Nornally reson for backfire is when intake Valve open Internal combustion in Cylinder. Pls Check Your Ignition Timing & Valve Timing. ( I think Your Timing Advancer is Defect )

Posted on Jun 01, 2009

  • 5520 Answers

SOURCE: Jerking on normal acceleration.

You might try a TPS switch. It should set a code but yours did't. The throttle position sensor sets the spark advance and fuel flow to match. The other possibility is the EGR system which also should set a code.
If you have not changed the fuel filter,try that because if you accellerate hard the fuel slooshes to the back of the tank.
In normal driving the contaminents lay on the bottom of the tank.

Posted on Aug 18, 2009

  • 12139 Answers

SOURCE: 2001 Bonneville

check front suspension and tire balance could be bad idler arm to tires out of balance

Posted on Sep 27, 2009

roniecon
  • 6826 Answers

SOURCE: 91 caviler running on 2 cylinders just changed

If the two dead cylinders are close together,then the head gasket may have blown out in between them.See if the timing has jumped.If it has a coil pack,the the coil pack may not be firing the two dead cylinders.

Posted on Nov 20, 2009

SOURCE: car chugs and jerks like crazy while cruising

Determine whether the jerking is engine or transmission related. One way to determine if it is the transmission lock up converter is acting erratically is to down shift out of OD. And see if jerking persist. If it goes away suspect transmission to have problems with torque converter or TCC solenoid . If it doesn't go away determine whether or not the engine sounds to be misfiring. If so vehicle may require a tune up. Many vehicles can be diagnosed for free at your local Auto Zone.

Posted on Jul 19, 2010

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2 Answers

Idles ok backfires thru exhaust under a load


Since it is so old, Start with a compression test. 90lbs is about minimal. The cylinders should be with in 10% of each other. If your there or lower, Time to retire or rebuild this engine. This part here will save you time, trouble and money into an engine that won't be any better when your done.

Feb 08, 2016 | 1987 Ford F 150

1 Answer

Engine light is on and very heavy on fuel backfiring when pressing accelerator


Engine lite means engine is not running properly, backfire means you have a ignition problem, bad spark plug wires, bad spark plugs heavy on fuel means it is not burning the fuel properly to get good power from it. Check or replace plugs and wires. put some injector cleaner into the fuel tank if it is fuel injected

Nov 06, 2015 | Cars & Trucks

1 Answer

2003 blazer p301 code ive changed coil plugs check engen still flashing when accelerating


The flashing light means the problem is serious enough to damage the catalytic converter.
The code means cylinder 1 is not producing power. So it could be fuel, compression, or ignition related.

Feb 05, 2014 | Chevrolet Blazer Cars & Trucks

1 Answer

4.3l backfires through throttle body


check the firing order as it indicates 2 wires crossed

Jun 30, 2017 | 2000 Chevrolet Blazer

1 Answer

1997 Oldsmobile Achieva - check engine light is on and car is running sluggishly...brand new motor installed 6 weeks ago.


What speed are you going when it chugs?
It could be as simple as a bad spark plug or a spark plug wire/boot grounding out.
When spark plug boots get old, the rubber cracks and lets voltage arc out the side and to the engine instead of through the plug.
This will be most noticeable when trying to maintain a speed of over 40 mph, or under mild acceleration.
The reason for being noticeable at this speed/acceleration level is that the transmission torque converter will be locked, transferring the vibration from any engine miss straight through to the wheels.

Jan 07, 2012 | 1997 Oldsmobile Achieva

1 Answer

I have a 2002 ford escape with about 170,000kms. From a cold start she runs perfect. But when i make a stop and park for a short period of time then go to leave is the prob. Starting up is no problem but...


Misfire, From a cold engine you wont have the misfire. When you engine is cold fuel is in demand and it will run great. As it warms up the fuel strategy is to lean it out (proper balance is 14.1 to 1) . At normal operating temperature the spark plug required KV is 15kv. As you accelerate the sparkplug require more voltage from its coil reserve and it delivers and at the same time the engine demads are high in order to accelerate and the spark will seek the easiest path spark plug, now when you come to a stop the demands for spark decrease and it seek the easiest path where is that at ? out through the boot of the spark plug, The vehicle is equipt with what they call COP (coil on plug) along the boot path it deteriates and so does the coil it deteriates .170,000 mile of hard working COP. they are at their worn stage you can find the weak coil with a cop tool because it misfire on acceration your looking at a boot,probable water got in there shorting it out,if it misses at idle its either water in the boot or the boot itself or the cop.

Apr 24, 2011 | Ford Escape Cars & Trucks

1 Answer

1992 Lumina Backfire - I have a 1992 Lumina Euro, 77K miles, 3.1 V-6. Under moderate to hard acceleration the engine will backfire and you can smell gas. The spark control module, coils, wires, plugs,...


I know you mentioned the EGR valve has been replaced, but you may have a bad 'new' part. I know the car is electronic, but has anyone checked its ignition timing (timing belt been looked at, I know it only has 77k on it). Is the fuel pressure regulator OK and it vacumm supply?

Nov 15, 2010 | Chevrolet Lumina APV Cars & Trucks

1 Answer

Jerking on normal acceleration.


You might try a TPS switch. It should set a code but yours did't. The throttle position sensor sets the spark advance and fuel flow to match. The other possibility is the EGR system which also should set a code.
If you have not changed the fuel filter,try that because if you accellerate hard the fuel slooshes to the back of the tank.
In normal driving the contaminents lay on the bottom of the tank.

Aug 12, 2009 | 1992 Mercury Grand Marquis

2 Answers

Backfires in manifold on motor on acceleration. runs ok low speeds


Spark plug wires. If you take it in a garage or wait till it's dark, and have somebody brake torque it while you watch, you'll see spark jumping. But don't get run over! Do it in reverse. Or just change the wires.

Jun 01, 2009 | 1997 Dodge Caravan

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