Question about 1998 Cadillac Seville

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Car is running very rough

My car first stated with a shake, then it felt like there might be a fuel pump problem, now it feels like it is missing all together and has a ticking sound. The car has 75K and the service engine soon light is on and sometimes blinks. It seems to run a little better with the AC off. I thought the engine did not need a tune up for 100k. Please help I do not have much money to fix a major problem. Any suggestions. Thanks Kimberly

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  • ivanog Jan 02, 2009

    when I push the gas pedel it feels as if it is knocking (more so up hills)



1 Answer

Sounds like mine. I changed plugs and wires and it went away. Could be the ignition coils also.

Posted on Aug 20, 2008


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Related Questions:

1 Answer

Fuel pump does not come on when you turn the key to on but it comes on when you crank on it. Any suggestions what to check ?

Try a new fuel pump relay. It should be under the hood in the relay/fuse block. Relays only seldom go bad, so if not the relay, maybe the wiring to or with the relay. Try this: hold your finger lightly on the relay, while someone turns the key to on,not start. If you feel a click, the "coil side " of relay is good. So the problem may be with the power side of relay-either relay is bad or the power feed is missing. If you have a test light or voltmeter, you could test for power at one of the relay's terminals. One terminal should have power at all times, so key could be off, pull the relay, and check for power. If one terminal has voltage (battery voltage), and you felt the click, probably a bad relay. If no power to the relay, key off, then check the fuel pump fuse. The feed for the pump is missing.
If you do not feel a click from relay with key turned to on, either relay is bad, or the signal from the computer to relay is missing, or the ground for the relay's coil side is bad.

Post back with make and model and year if I can be of further help. Good luck.

May 06, 2015 | Cars & Trucks

1 Answer

Why does my car misfire randomly at idle and sometimes at operating speed/rpm?

A faulty air intake sensor can fool the management system into rich or lean fuel mix, causing rough running. Check exhaust emissions for rich fuel smell. That should at least rule another line out if nothing else...

Dec 21, 2014 | 2001 Oldsmobile Alero

1 Answer

Ticking in engine

The rocker arm has to be set perfectly so as to not be TOO TIGHT or TOO LOOSE.. TOO tight and it will miss/shake/vibrate ... too loose and it will TICK/make noise and not run well...

Aug 22, 2017 | 1996 Mercury Grand Marquis

1 Answer

92 Thundebird 3.8...starts hard....really rough idle in any gear...sounds loud. Almost feels as if the engine is shaking

run fault codes and look for position sensors --MAP/MAF/VAF sensor problems and fuel /injector faults.

Jan 06, 2014 | 1992 Ford Thunderbird

1 Answer

Hesitation on acceleration

Can be egr valve, enginge usually shakes back and forth like a huge miss most times. I would definatly check in this order: fuel filter, fuel pump. Sometimes the pump may run, but be too weak to run an engine at speed or under load. If you replace the filter and pump, and it still don't help, then at least you know for sure its not the pump or filter, and move on to the egr, vacuum leaks, etc. Sometimes its a "search till you find it" type thing.

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1 Answer

My '99 VW Passat is shaking, like it's going to stall.

That indeed is strange. It could be one of or a combination of things a number of things: a dying fuel pump, bad plugs or plug wires, a dirty fuel filter which needs replaced, carb problems, water in the gas. If you have really high mileage on the car, it could even be a bad clutch getting worse. Other than those admitted "guesses" I have no idea. If this has never happened before, I would give it a new fuel filter, put in a good additive like Sea Foam, make sure it is firing on all cylinders and take it from there. Good luck, bro . . .

Jul 03, 2017 | 1999 Volkswagen Passat

3 Answers


The P0304 indicates the #4 cylinder is misfiring. The flashing light means the cylinder is not firing at all...It could be several things causeing it, coil, wires, plug, injector or vacuum leak. Do not drive your vehicle until you have this repaired, as it will lead to further more costly problems. Good luck, i hope this helps.

Jul 27, 2011 | 2003 Saturn VUE

1 Answer

Shakes and misses while accelerating , has a tick to the engine , i already replaced the spark plugs and wires, 1 new coil pack, air filter, fuel filter , new rear rocker arm and push rod. and oil change

Sounds like you still have a problem where the ticking is coming from. You may have to run a compression test on that cylinder you put the rocker arm on, are that side of the motor that is ticking. Could be the cam lobe wore down and need a camshaft.

Mar 09, 2011 | 1995 Chevrolet Lumina

1 Answer

Running rough. At 70-75 km/hr it seems to

sounds like a spark plug is fouling out,or a clogged fuel filter.

Apr 07, 2010 | 1997 Dodge Intrepid

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