Question about 1994 Mazda 626

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Back fires, surges, uses a lot of fuel - 1994 Mazda 626

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Change the spark plugs and clean the inyectors some times is the gas compresion regulator

Posted on Feb 08, 2010

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Caddy just started surging at road speed with throttle steady. Idles fine, and when you mash the gas performs fine, just surges and jerky at steady throttle about 40 to 55 mph.


Sea Foam will clean your engine - intake, injectors, combustion chamber, etc. "Hi Test" will not.

Higher octane fuel actually has higher resistance to exploding. High compression engines need higher octane to prevent 'pre-combustion' or detonation (explosion). Diesel engines do not have a spark plug and rely on diesel fuel detonating due to the very high compression (sometimes 2.5 times what you see in gasoline engines). When octane is not high enough, just the compression stroke will cause the gasoline to detonate on its own prior to the spark plug firing, causing pinging or knocking.

So, DON'T USE 'HI-TEST' gasoline to clean out your engine - it will NOT perform that function for you!!!

Feb 03, 2015 | 1999 Cadillac DeVille

1 Answer

Rough running on acceleration all the time back fires and misses choking


Have the car scanned for diagnostic trouble codes " DTL's ". That should give you a starting point

Feb 16, 2013 | 1994 Mercury Grand Marquis

1 Answer

How do you know if your spark plugs are the problem?


bad spark plug or bad wire will cause one cylinder not fire cause engine to surge.but change spark plugs and wires, if engine still surge have fuel filter changed, check fuel pressure weak fuel pump will cause engine surge.if you see check engine light flashing code scan for faulty TPS SENSOR OR FAULTY FUEL INJECTOR OR BAD IGNITION COIL.FAULT IN THE PCM.

Sep 23, 2012 | 1996 Buick Skylark

1 Answer

1991 chevy 4x4 2500, we changed the distributor,


Timing chain and gears may need replacing. Is the timing correct? Like number 1 at top of compression stroke and the dist. is on 1. How about a new coil too. Try a coil first. They go bad on these a lot.

Jul 12, 2009 | 1991 Chevrolet C/K 2500

1 Answer

Starts and runs then will not restart.


You may want to check the ignition module underneath the coils on the back. You usually can bring it in and test it at a local auto parts store. As far as the surging, that usually means something fuel related. Hope this helps.

May 11, 2009 | 2000 Chevrolet Malibu

1 Answer

96 mtrhme 460cuin fuel injected . Strtz hard ,


when was the last time it was tuned up?

Feb 27, 2009 | 1996 Ford F250 Crew Cab

1 Answer

Sidekick is surging


check for vacuum leaks, small hoses and brake booster hoses
lcbr1911

Nov 16, 2008 | 1991 Suzuki Sidekick

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