Question about 1994 Cadillac Seville

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My car is bucking at stop lights and at idle, the rpms are jumping and dropping, we changed spark plugs and fuel filter, we were told it might be the ignition control module, could this be the source of our trouble...

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Posted on Jan 02, 2017

  • 625 Answers

SOURCE: 1993 buick le sabre no spark problem

you should be hable to get some free repair tips at, or buy it, but i will recomend you to replace the crankshaft sensor, because the crank sensor and the ignition module is what trigers the coils, i hope and i been help full and i will apreciate the ranking to me.

Posted on Jun 17, 2008

  • 750 Answers

SOURCE: 93 Isuzu 2.3 4 cyl. Bucks at low rpms

first check fuel system, check fuel filters, fuel preasure & flow, service IAC sensor (idle air control) or replace also sparc plugs & wires .

Posted on Jul 22, 2009

  • 49 Answers

SOURCE: when sitting idle the rpms jump from 500 to 2000

try some sea foam in the gas tank auto parts store will have some. good luck.

Posted on Oct 23, 2009

  • 5763 Answers

SOURCE: my car is dropping rpms. It may idle OK but when

this could be caused by many things, the most common could be a weak fuelpump or a cylinder misfire, have the computer scaned and see if there are any codes stored, autozone scans for free.

Posted on Dec 26, 2009

  • 752 Answers

SOURCE: rough idle. rpms drop. misfire.

try your coil packs they go over your sparks or do plugs first and see what happens do affordable first

Posted on Feb 01, 2010

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2 Answers

Engine idles rough at red lights begins loping rpms drop to almost killing, then cycles back to normal, then repeats rough idle drop in rpms and loping, back and forth until I rev engine or take off

You could have a clogged fuel filter, if you haven't changed it in awhile. You could have a leak in the intake system somwhere also. When you slow down, you get less power to the engine. It may need spark plugs and wires as well, if in need for a tune up.

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try your coil packs they go over your sparks or do plugs first and see what happens do affordable first

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I'd be curious to the miles on the engine, possible worn rings, poor compression. Start with basics first, be certain there are no vacuum leaks, next look to your fuel system; possible failing fuel pump (low fuel pressure) dirty fuel filter? (I'd start with the filter first, cheapest fix if it is the issue) other concerns could be injectors, plugged or failing (poor fuel spray) run a fuel systems cleaner for several tanks see if it will improve; but change that fuel filter first. Also the volts dropping off would make sence if the engine RPMs drop way off, too slow of a speed the alternator will make little if anything.
I hope this may have helped,

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spark pug gaps are critically important & can even stop a car from starting! start there!
then reset the timing!
computorised cars should be banned! lol

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