check engine light

light comes on and goes off, the shop said it was a cam position sensor but them put a new one in and it didn't help, so now they want to put in a crank sensor.....any ideas????

also the idel is kinda fluttering.

Sounds many like the EGR valve... I had to have mine replaced after about 130,000 miles. That will cause the light to go on off... Should have an error code in memory then... Also... I was told by my dealership to replace my cam/crank sensor when it was actually the EGR valve... You should remove it and see if there is a lot of carbon built up. I do believe the crank and cam sensor both connect to the ignition mod. then that goes to the PCM.... a crank or cam sensor might cause the RPM gage to bounce a little... In 4 years I've done it all to my car, new engine, rebuilt trans... it's like a new car...

now they are telling me nothing is wrong with the car and the light is because a short in one of the wires>? sounds like bs but iv had it at a gm dealership 4 times now. I can't sell it like this.

now they are telling me nothing is wrong with the car and the light is because a short in one of the wires>? sounds like bs but iv had it at a gm dealership 4 times now. I can't sell it like this.Can you tell me the code #maybe I can help

ok thanks, brackets are quotes from the work orders, (code po342 cam se nser problem) they then (put a new cam sensor still ses light on, measure voltage @ cam connecter all good, possiable int condition between cam senser & pcm ne- ed)

3rd time

(check for ses light on, found history code of 0341 cam/crank error, replace crank senser no codes returned) but bye the time i went to pick up my car the codes were returned.

Thanks for the help.

If they say it's a shorted wire, why didn't they fix it?

Because they say they can't find the wire that it screwed up and that it will take hours to trace all the wiring.

Because they say they can't find the wire that it screwed up and that it will take hours to trace all the wiring.From what i know most of times it is your PCM ,but you can not be sure until you check it. and make sure that is the problem.
As far code 341 it could be is your timming chain or cam magnet on cam pully.but never know til you check it

isn't 42 The EST signal did not change when the ECM applied bypass voltage to the ignition module ?? what the heck dose that mean because they told me it was a cam sensor error.

Well the information on that wire.. if it's the check engine light right... that's the Brown/White wire coming out of the gage cluster. It's on the 16pin connector, "A3" on the connector, from what I have read that wire goes right to the PCM... And on the PCM it's on the white connector "D13".

Well the information on that wire.. if it's the check engine light right... that's the Brown/White wire coming out of the gage cluster. It's on the 16pin connector, "A3" on the connector, from what I have read that wire goes right to the PCM... And on the PCM it's on the white connector "D13".

were is my pcm? and are you sayign i should cvheck this wire and could this make the check engine light go on for a 42 error?

http://www.troublecodes.net/articles/gmmsundrstd42.shtml read this and tell me what you think!

The PCM is right behind the glove box... the black panel above your feet on the pass. side can be removed and you can access the connectors there... I think I have been wrong... are you talking about a wire from from check engine light to PCM or A the wires from the Cam sensor?

from the cam sensor

The cam sensors first goes in to the EI module... then from there to the PCM... the cam position sensor has 3 pins, two of which go to both the EI mod, and the Crankshaft sensor, the share wires are Red/Gray is a ground, and White/Black wire is sensor feed. The 3rd wires, Brown/White is the cam signal... those are the 3 wires coming out of the cam sensor... and going to the IE module... Then from the IE module, to the PCM, the cam signal wire is Black, it's on the red connector of the PCM (B9 to be exact)

sorry if I haven't been of much help... I've just started working on my own car in the last couple months

thanks but it's dam near imposible for em to chase the wires for their whole length.

What I've done in the past is run a new wire and disconnect the old one and see if that fixes the problem... Normally that means having a wire or two coming out the hood and in the windows, but if it works perfectly fine with a different wire then you know for sure it's the problem and then you can spend more time running a new wire in a much better way.

good idea thanks.

Make sure if you try that to keep the wires clear of the sparkplug wires... and I don't think I have to tell you what would happen if a wire got wrapped around a pulley.

jadmonkey egr valve can really triger a cam sensor code? how difficult is it to replace the egr valve and how much?

My EGR valve went bad it caused error codes all over the ignition system... I don't think it would cause the cam code. You said it's ideling funny, that can be a sign of the EGR not working right. You should have someone scan the error codes. You could rule out the EGR at the dealership if they use a tech tool to and do a test on it. It's a 150 dollar part, (300 at the dealership) very easy to swap out, two bolts and one wire connector. Did you rule out any problems with the wires connected to the cam sensor?

no because a guy on another fourum wrote this to me,

An egr code is P0401 not P0341
P0341 is a cam positioning sensor not a crank sensor
You can't run a wire from cam sensor, its not wired that way.
The cam sensor sends a signal to Ignition Module and the module sends a signal to PCM (engine computer)

have seen this concern on the rivera many times for this year and common failure is the wire getting pulled at the large electrical block connector.Its the main engine harness that is located near the transmission dipstick. Have them check circuit number 630. I think the connector number is C101 cavity A7 black wire.

so ima get the dealer to check that out.

thanks

I had the same problem with my 1997 Riviera. The dealer at first thought it was a crank sensor, then upon further testing found out it was code "PO341" - "found open wire" The wire was fixed and I have had no problems since

I had the same problem with my 1997 Riviera. The dealer at first thought it was a crank sensor, then upon further testing found out it was code "PO341" - "found open wire" The wire was fixed and I have had no problems since


Where was the open wire you found located? Thanks!