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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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.

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2 Answers

How do you know is the fuel pump is bad

It won't be pumping fuel if it's bad, remove pump and connect to battery you will feel vacume with your finger

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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.

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If you also feel like the engine is not smooth, it doesn't sound smooth, it may be due to a cylinder miss-fire. This could be due to lack of spark, or fuel. If this sounds like what is wrong, you need first to verify what is missing, (Spark or fuel) and go from there.

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