Does anyone know how to check the cam/crank timing isn't matched to TDC and how to fix it. Thanks

 

your cmp and ckp are both located in the distributor. you only check the sensor's resistance. if they aren't lined up with tdc you have a bad dizzy or your intake cams off a tooth or something silly. pull the valve cover and check cam timing. if you're familiar with a dmm and know how to test resistance then reply and i can give instructions on what to do and values to look for. i'll need the year of the car.

 

My car is a 2001 gsr. Can u show me how to check the resistance. Thanks

 

actually, on your car you can replace just the crank position sensor... i assumed your car was an obd1 car. its part number 37500p72a01 and its 118 bucks.

 

My car is obd2b. Just want to know why replacing the crank position sensor can fix the problem. Thanks

 

the reason replacing the sensor would work (assuming cam timing is correct) is the fact that coming up with different resistance values than what the normal resistance values are would throw the computer off. normally you'd be throwing a code for this, something like a p0335 code or something close to it. if you weren't throwing a code (or a MIL/CEL) it would be because of the learning curve of the ecu itself. the ecu would take set values programmed and replace the actual values as needed to cause the car to run better. the reason for doing all this is totally an emmissions and/or a driveability thing.

 

at this monent, I only get the misfiring code. Don't know what causes it. Do u know where I can take it check beside paying a big buck to the dealer? Thanks

 

Which misfire code are you getting? 71, 72, 73, 74, a combination of some of them or all of them.

If you're only getting one of them narrow down you search to something that's individual to that cylinder... spark plug wire, spark plug, fuel injector, etc. Looking at the fuel pump or crank sensor in this case would lead you astray.

If you're getting all of them then look at something common to all the cylinders, distributor, map sensor, fuel pump, etc.

Post which code you're getting and maybe we'll be able to help you out further.

 

It is random misfiring. I also notice that the idle go up and down when I start the engine in the morning. It went up and down between 2000- 1000 rpm when the engine is cold. After it warm up, it just stay around 1000 rpm and not much up and down like when the engine is cold. Need some help. thanks

 

What's the mileage on it? Do you know when it's misfiring? High RPM, low RPM, high engine load, low engine load, etc.

The instable idle on cold startup sounds like a different problem but could be linked. Does the Check Engine Light flash when the idle is instable? Cleaning the IACV at the bottom of the throttle body and throttle body itself as a first step.

With regards to misfire first look into the ignition system, check the easy stuff first; spark plugs, spark plug wires, distributor cap and rotor. Make sure these are not worn excessively.

Let us know the results.

 

The wire, cap and rotor are new. The engine is only 32,000 miles. It misfire at low rpm, low engine load. The check engine light does not flash when the idle is instable. Thanks

 

What's the mileage on it? Do the plugs look okay?

Next place I'd look at is fuel... is the fuel pressure where it should be, is the fuel pressure regulator working properly. A scan tool would show you fuel trim, if it's at or near zero you probably don't have an issue with fuel delivery. If it's trying to add fuel then possibly a fuel issue.

I'd bite the bullet and take it to a mechanic. Get a proper diagonsis you can decide if you're gonna fix it or have the mechanic fix it.

 

I just bought a fuel pressure regulator and going to replace it this sat. I let u know what happen then. Thanks for your help

 

change the fuel pressure regulator, spark plugs and wires, whole distrubtor, map sensor, fuel injectors. Did a compression test and fuel pressor test and both are fine. Still have random misfire. Most of the time in cylinder 2 and 4. Don't know what to do. DO u think the acura dealer have a way to find out? Please help. Thanks