Question about 1998 Cadillac DeVille
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Posted on Jan 02, 2017
these are under that big silver plate looking thin remove it and look for eight of these all the same with a rail going to all of them, and a wire plug in,u may have one unpluged or cut or melted or something but one of them is not getting signal from wire
Posted on Jun 27, 2009
Yes this is a common accurance which is usually fixed by running injection cleaner in a full tank of gas.....Hope this helps.
Posted on Oct 12, 2010
SOURCE: I HAVE A 2000 CADILLAC
A miss #4 may mean that one or more of the following has happened:
* Faulty spark plug or wire
* Faulty coil (pack)
* Faulty oxygen sensor(s)
* Faulty fuel injector
* Burned exhaust valve
* Faulty catalytic converter(s)
* Running out of fuel
* Poor compression
* Defective computer
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back. If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.
A couple of things you need to check here. First make sure you don't have any vacuum hoses unplugged. Next make sure the throttle blade closes all the way. It is probably not either of those things but you need to make sure. Next remove the Iac valve from the throttle body. It is on the side facing the front higher than the tps sensor. It has a 4 wire connector. Make sure this is clean. If it is not clean it. This valve controls the idle speed. After cleaning it turn the ignition on with the engine off. The IAC shouldmove in and out to find the stops. If it does not move you have either bad wiring, IAC (Idle Air Control valve) or PCM.
Does the IAC move back and forth? Also does your Throttle blade close all the way? The throttle blade is inside the Throttle Body. Take off the rubber intake hose and look inside the blade should be closed. Check to see if the IAC is moving by taking it out. hook up the connector and turn the ignition on with the engine off. The IAC should move in and out to learn the stops.
If the blade is open It is stuck. Check the throttle cable to make sure you have slack. If there is slack and the blade won't close try cleaning it to free the blade up. If there is no slack remove the cable from the blade to see if it closes farther. If it does your cable is bad. I still think your IDLE system is more likely though.
If nothign occurs, that is not the throttle blade. You need to check the IAC. Also try while the engine is abnormally idling high wiggle the connector at the IAC. If that doesn't work you need to check the wires from the PCM to the IAC, it could also be a bad PCM driver. You diagnose a PCM by eliminating everything else.
Keep us updated.
Posted on Jan 05, 2011
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