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V8-4.1L

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Question
Car has rough idling, occasionally seems it would stall
Hello. Replacing the fuel injectors will not cause this. If it only stalls at idle, I would clean the throttle body first. If it is dirty, then this will occur. If it is fine, then it may be an air...
Question
Car misifires under load, P0300 code
Hello. The P0300 code refers to a detection of a misfire in one of the cylinders. If the car idles fine and only acts up during acceleration with this code coming up, then it is usually caused by a fuel...
Question
The new ignition is locked, cannot turn over
Hello. When you install a new ignition and a new computer, it needs to be reprogrammed to communicate correctly. This can usually only be done at the dealer. If they are not programmed correctly then the computers will not communicate...
Question
The car cannot be started at all
Hello. If the starter and the battery are in good shape then the battery cables need to be tested. These are common failures on this vehicle. If those are fine, then it is either an issue with the ignition switch...
Question
Check engine light stays on
Hello. In order to know why the light is on, I would need to know the codes from the computer. It can be anything for a computer issue to a bad gas cap. I usually scan the computer first to...
Question
Problem with knock sensor or coils
Hi there, many others have reported shaking during idle with the Q45 around that time. Replacing the coils has been reported to fix the issue, however there are other components that could be affecting the engine's smoothness as well so...
Question
I think my Distributor O ring is leaking and can see oil run down from under the Distributor
On your '86 Cadillac Deville, you should be able to find the timing marks down toward the bottom of the water pump. There will be a cylinder looking tube attached to it with numbers on it reading from 0-20. These...
Question
Tire making strange noise
Unfortunately there can be a variety of reasons as to why your Cadillac is experiencing noises in the wheel area. With the information provided being a bit limited, I would recommend enlisting the assistance of a certified mechanic, such as...
Question
What else can cause a shake/vibration/shimmey?
Hello. Although you mention that you have new tires, there are instances where the construction of the tire is such that it will vibrate no matter how well it "appears" to be dynamically balanced. This is based on what...
Question
I have a loss of power when acceleration the car does not drive pass 10 or 15mph I change the plugs and also change the fuel filte
This may be result of a failing or dirty mass airflow sensor. This is a unit that is responsible for regulating the air flow into the engine as it is mixed with fuel prior to being injected into the motor....
Question
Where are the pump relay and fuses located?
Hi there - the fuel pump relay is under the hood, at the rear of the engine compartment, fairly high up on the firewall. There are a row of 3 relays, just behind and slightly to the right of the...
Question
Power steering belt broke & need to replace it. How do I replace it?
Typically, you would loosen the mounting bolts for the power steering pump and adjust the angle of the pump until the belt is loose enough to remove. There may be one or more belts for other accessories in front of...

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