Question about 1996 Mazda Millenia

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Runs rough and keeps fouling out new spark plugs

Vehicle runs really rough, keeps fouling out spark plugs after replacing them several times

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Plugs could be wrong heat range they could be too cold make sure you have right heat range.if all is good.replace air filter.have injectors tested they could be leaking when you turn engine off.have charcoal canister check.check fuel pressure regulator for rupture diaphram.if all is good.scan it check egr valve.if stuck open a little it will cause rough running foul out plugs.

Posted on May 29, 2009

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Sounds like too rich of a mixture check for vacuum leaks and check fuel press regulator

Posted on Apr 23, 2009

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1 Answer

Just changed the timing gears and chain,now the car idles rough and keeps fouling out one of the front spark plugs.


Year/make/,model???? Was the timing chain replaced to correct this problem or has this problem developed after chain replacement? Compression test performed? High mileage on engine?

Jan 13, 2016 | Cars & Trucks

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I recently replaced a cool pack on my 2001 dodge Durango now it is running really rough and it keeps dying and getting hot any suggestions?


The problem you describe is likely unrelated to the new coil pack. Rough running and stalling can be indicative of a fuel delivery problem, contaminated fuel, or one or more bad spark plug wires (or fouled spark plugs, but less likely). Readout all stored codes from the ECU using an ODB reader for a diagnostic starting point.

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1998 bmw 540i having a misfire on cylinder 5 changed the plugs and coil packs. It ran fine for a couple days, then it began again, giving me a check engine, and it's idling rough at low rpms.


Is the same cylinder causing the problem? If so take a close look at the spark plug for fuel fouling. The cylinder may be over fueled causing plug fouling. You may also have a bad coil or defective spark plug. Try swapping coil and plug with one from adjacent cylinder to see if misfire changes to that cylinder

Apr 06, 2015 | BMW Cars & Trucks

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What would cause the idle to jump up and down upon starting the vehicle?


Sounds like you've done everything but the injectors. Run a bottle of fuel injector cleaner in a tank full of gas every time you do an oil change after this time. Also, check the fuel pressure to see if it's where should be for the injectors. But then, if it has enough pressure to go through the dirty injectors to make it run, pressure should be good. Check it anyway.

Sep 09, 2014 | 2006 Chevrolet Trailblazer Ext

1 Answer

Hard starting, rough idle when cold, then smooth running when warm


Need year/make/model/mileage of vehicle to provide a more specific set of troubleshooting steps.

When was the last tune up? Hard starts when cold are usually caused by fouled spark plugs, worn plug wires, or weak ignition coils. Fuel systems are not as effected by temperature changes as the ignition components.

Nov 28, 2012 | Cars & Trucks

1 Answer

Black smoke from exhaust, rough idle, black soot on plugs


signs of a bad fuel pressure regulator-- the vehicle will run rough, the engine will not start ( usually in the mornings,) many times engine starts but stalls shortly after starting. a bad regulator can result in fouled plugs. replacement is only cure. 1- black soot on plugs-2-black smoke from tailpipe-3- running rough-4- stalling, good-day! repost if need be.

Aug 10, 2011 | 1994 Suzuki Sidekick

2 Answers

Bought it a couple months ago with 44k mi. now has 77k mi. started missing, running rough, severity is worse about 40mph. tried putting in a set of plugs, didn't help. noticed #5 plug soaked with fuel,...


First you say #5 doesn't appear to be firing

Then you say the coil pack is okey and you have spark

Also worse about 40 mph but plenty of power
You can't have it both ways

You have an issue with cylinder #5 causing a
drivability problem

I would have thought that you would have checked
for a leaking injector on #5 and a misfire also.

You will have to pick the way you approach this

You really need to current ramp the injector voltage
compared to the others
Switching the injector to another location will be
time consumming and a new one expensive.

Jan 28, 2011 | 1993 Mercury Grand Marquis

1 Answer

The explorer stalls at idle. it's not running rough and it runs as long as the rpm's are above idle


Possible causes: dirty fuel injector; get a can of injector cleaner which you had to your fuel tank and run the vehicle for a few days.
Fouled spark plug(s); have plugs checked and replaced if needed.
Improper engine timing; Have engine timing, (the timing of each cylinder firing) by a qualified mechanic and have timimg adjusted if necessary.
If none of the above helps have a diagnostics run to determine cause.

Jan 02, 2010 | 2002 Ford Explorer

2 Answers

Failed spark coils on my 1999 Lexus ES 300. Replaced one last March and two more last month. I read that fouled plugs could cause coil failure. Since the recommended schedule for ''hard driving...


exposure to heat, weather,salt in winter and water make them more susceptible to failure I would change them knowing that my others failed

Aug 25, 2009 | 1999 Lexus ES 300

1 Answer

95 GMC Jimmy 4.3l W vin rough idle


My problem was solved when I repaired my 4 wd activation dash switch. The switch was contacting on 2WD & 4HI at the same time. The front differential activation is vacuum activated possibly creating a tug of war that didn't actually engage it but drained off vacuum from the engine? A theory at best but stumbbled across it because I knew the switch wasn't working properly I repaired it and low and behold rough idle disappeared and all is good for 3 weeks running.

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