I have not been able to track down why my car is running so rough ( like 5 cylinders) after new headgaskets. If crank sensor is bad will it be a no start situation. It could have been rubbing from the looks of it. I did re-adjust it and still have same problem. Doesn't either work or not work?
Can crank sensor cause a rough run condition
- Thread starter Mike70gtx
- Start date
Scope it.
The best way to figure out if the crank sensor is working or not is to back probe the connector and put an oscilloscope on it. This way you get live data. You can see the wave form it produces. It can cause your car to be a no start in some situations. But others it will cause a rough running vehicle. misfires and what not. Make sure the reluctor wheel( the piece that spins with the crank) is still in good shape.
The best way to figure out if the crank sensor is working or not is to back probe the connector and put an oscilloscope on it. This way you get live data. You can see the wave form it produces. It can cause your car to be a no start in some situations. But others it will cause a rough running vehicle. misfires and what not. Make sure the reluctor wheel( the piece that spins with the crank) is still in good shape.
did it fix the problem
- Joined
- Feb 18, 2006
who'da thunk?
:tongue:
Forgot to put the link in my post above...:biggrin:
http://www.turbobuick.com/forums/general-turbo-buick-tech/228669-fuel-pressure-idle-too-high.html
http://www.turbobuick.com/forums/general-turbo-buick-tech/228669-fuel-pressure-idle-too-high.html
The new crank sensor made no difference. But the new ignition module did. It does run now but ti is still a little rough. My #1 cylinder plug looks a little wet. lt does not look like its burning like the other cylinders are. New crank sensor, new cam sensor, new ingnition module and coil, new plugs and new wires. Could I have done something when I put motor back together. The rockers on that side are moving up and down. Could I have a leaking intake gasket or could the egr cause that?
I used the end of a zip tie. I used a spark plug gapped at 25 to make sure. There is a good chance that my reluctor is not perfect. Would it be hard to change it out? But it didn't run any different with the old sensor versus the new one. When I changed the ignition module it runs good enough to go to town. It used to foul all the plugs. Now just #1 seems different. Like I'm running on 5 to 5 1/2 cylinders.
What are your BLM's at idle?
Swap injectors on the suspect cylinder.
Swap plug wires on suspect cyl.
Do compression check.
You say you just changed headgaskets? I would do a compression check and make sure everything is all good.
Did you tighten the grounds on the back of the pasenger head good?
Swap injectors on the suspect cylinder.
Swap plug wires on suspect cyl.
Do compression check.
You say you just changed headgaskets? I would do a compression check and make sure everything is all good.
Did you tighten the grounds on the back of the pasenger head good?
Blm's were about 114-116. I already pulled injectors and had them flowed. The strange thing is when this process started, which was about 2 months ago, number 3 seemed to be the problem one. That was when I pulled the valve covers. The only other thing different is a new 4" maf pipe with the new sensor from Fullthrottle. I sent the translator and computer in to make sure they were good. After my last run I switched plugs and used another plug wire.
For some reason when I put my ls1 maf and translator my car had blm's of 105-110 and I couldnt raise it no matter what I tried. My car idled terrible and kept killing the plugs. I finally switched my translator setting from 3.5" to 3.0" 10% lean and it brought my BLM's to 130. I have a 3.5 maf but this setting seemed to correct my problem. Dont know why but it works for me.
I am not familiar with that 4" setup but move some initial settings around and reset your ECM each time and see if it helps.
Try it...dont cost nothing.
I am not familiar with that 4" setup but move some initial settings around and reset your ECM each time and see if it helps.
Try it...dont cost nothing.
