Ask the Car People.SM


Chevy C/K Series Maintenance and Repair - READ ONLY

449 messages,  Last post on Apr 14, 2008 at 12:01 PM

You are in the Pickups - Archived Discussions Forum.

This discussion is ARCHIVED. To reactivate the discussion, post a request in the Javascript runtime error--TypeError: obj has no properties-- see logJsError17.html for a stack trace discussion.

What is this discussion about? Chevrolet R/V 2500 Series, Chevrolet C/K 10 Series, Chevrolet R/V 3500 Series, Chevrolet C/K 20 Series, Chevrolet C/K 30 Series, Chevrolet C/K 2500 Series, Chevrolet C/K 1500 Series, Chevrolet C/K 3500 Series, Truck

Messages Page 26 of 46

#244 of 449 1997 C/K CAMSHAFT POSITION SENSOR PROBLEM by dchase1

Apr 17, 2006 (9:12 pm)

still cant figure it out.it is a cng bi fuel vehicle which makes it more confusing.bi fuel does not work .connections look good.brown wire going to alternative fuel box is broken where the two connectors go into box.hooked it up between the two connectors ran great for 20 miles but bi fuel doesnt work.shut it off .on the way home.ran real bad.took sensor back.installed another one.replaced distributor cap.could my distribitor be bad.is there suppossed to be play vertically where the rotor mounts?bi fuel was not working before problem.wire has not been hooked up since i had the truck.recently replaced driveplate.ran good afterwards.replaced starter.recent alternator.new ignition relay.oil change,fuel filter.still get code po 340 po340 po341.what is involved in the camshaft sensor circut?could a bad fuel pump relay cause this.is my computer fried?could just spark plugs cause this?vehicle sat unstarted for 3 months befoe driveplate was replaced.fuel pump?DIRTY TANK?fuel INJECTORS?CMon gotta be something stupid its a chevy not a ford.always ran good before.only has 60000 on it.idles fine,drives bad.lacking power.sucks on hills.i know its some electronic crap.gotta be.after you disconnect battery or clear code runs great for 10 miles.hit about 50 or 60 on slight incline i here a thump/backfire/miss not sure light goes on no matter what after 10 miles.driving me nuts.any one have similar exp. or know what is going on?helppppp.why does the camshaft sensor get no signal.i cant sleep my chevy is driving me nuts

#245 of 449 Re: Horn STOPPED working [disco2] by dchase1

Apr 17, 2006 (9:17 pm)

Replying to: disco2 (Mar 22, 2006 5:34 am)
try horn relay in fuse box under hood.

#246 of 449 Re: 1990 K1500 Tail light problems [willcg] by dchase1

Apr 17, 2006 (9:25 pm)

Replying to: willcg (Dec 06, 2005 4:32 pm)
try brake relay in underhood fuse box

#247 of 449 Re: COMPUTER QUESTION [bobm7] by dchase1

Apr 17, 2006 (9:31 pm)

Replying to: bobm7 (Apr 19, 2005 4:39 pm)
u have to have it reprogrammed by the dealer

#248 of 449 Re: 1997 C/K CAMSHAFT POSITION SENSOR PROBLEM [dchase1] by xwesx

Apr 18, 2006 (10:14 am)

Replying to: dchase1 (Apr 17, 2006 9:12 pm)
There has to be a sensor (separate from cam sensor) on that thing that detects the knock and tells the engine to retard the timing for pulling hills, acceleration, etc. I am still betting on it as being the culprit. Maybe I am way off base here - I have never fiddled with anything so new as a '97.

#249 of 449 305 - 350 Swap by c130efe

Apr 19, 2006 (10:29 am)

Quick question...I have a 94 K1500 with a 305. The engine is shot and I was thinking of replacing it with a 350. Can anyone think of any issues or complications to doing this? Thanks

#250 of 449 Re: 1997 C/K CAMSHAFT POSITION SENSOR PROBLEM [xwesx] by dchase1

Apr 19, 2006 (6:39 pm)

Replying to: xwesx (Apr 18, 2006 10:14 am)
wouldnt i get a code when i scanned it telling me it was the knock sensor.the sensors arent cheap.it does make sense,but the truck runs fine right after the idle is relearned for about ten miles.then all the bs starts.lack of power,vibration while at idle.could this be a dexcool issue?i dont know.something electronic i think,hard to figure out.all wiring seems ok.wierd ver wierd.

#251 of 449 Re: 1997 C/K CAMSHAFT POSITION SENSOR PROBLEM [dchase1] by xwesx

Apr 20, 2006 (9:59 am)

Replying to: dchase1 (Apr 19, 2006 6:39 pm)
Well, I have had to replace the knock sensor twice in my '96 Subaru, and not once did it pull a code for it. It always came up with the crank & cam sensor codes - and always in tandem.
 
I am not saying it IS the knock sensor, it is just that the electronic timing controls do require constant input about retarding/advancing to meet current conditions and the knock sensor is one of the primary controls of that operation. I think they also depend on the temperature sensors, the mass airflow sensor, and the 02 sensor(s). The 02 sensors, if failing, always pulled codes on my Subaru and the one time I had a problem with the MAS it caused stalling (w/ no code) - not idle issues (in other words, it ran perfectly until it stalled at a stoplight, etc).
 
I am not familiar with "dexcool." If the truck does run fine for a while after a reset, then perhaps something is causing the timing to artificially advance. It is apparent to me that the problem does not lie with the cam sensor itself... it is either not receiving a regular signal from the position marker on the cam or it is receiving bogus input from another sensor. Unfortunately OBDII does not always isolate the problem correctly and these electronic machines are really a nightmare to ferret out by traditional means.

#252 of 449 Re: 1997 C/K CAMSHAFT POSITION SENSOR PROBLEM [xwesx] by dchase1

Apr 20, 2006 (1:41 pm)

Replying to: xwesx (Apr 20, 2006 9:59 am)
i think im gonna try the knock sensor zwesx.its 40 bucks.but its cheaper than someone else throwing parts in my truck.from everything i have learned of knock sensors,it seems it is the most likely to go,cause it could have got damaged towing or on a lift.i believe the knock sensor is somewhat fragile.what i want to know is could a bad knock sensor cause the camshaft position sensor to malfunction.at least if it doesnt work i will know its not that rt.sound like a good theory.the other sensors have something to do with timing also,but i do like the knock sensor theory.it seems the most likely.do you think the knock sensor will solve the camshaft position sensor issue.basically the codes say that the camshaft position sensor is malfuntioning and that it is out of range which is 4 - 5 volts.no codes for high or low imput.po340 po340 po341.sinceit says camshaft position sensor circuit,i guess my question is the knock sensor involved in that circut.

#253 of 449 Re: 1997 C/K CAMSHAFT POSITION SENSOR PROBLEM [xwesx] by dchase1

Apr 20, 2006 (1:54 pm)

Replying to: xwesx (Apr 20, 2006 9:59 am)
the camshaft sensor is definetly no getting a signal.what besides the knock sensor could cause this.why would it not get a signal from the position marker on the cam.i do not believe my camshaft is bad because it runs like an animal after the idle is relearned till u hit a slight incline or after about 10 miles

Messages Page 26 of 46

Advertisement

Browse by Category

Browse by Vehicle
   View All Vehicles

Browse by Board
Browse by Topic
View All Topics

Edmunds Community

Advertisement