Question about 1999 Chevrolet Cavalier

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Cam sensor My engine post code said that my cam sensor was bad. so I change it with the instruction sheet supplied with part. the car will not start now. and have re installed old one and it still will not start.

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Try resetting your PCM if you have not done that.

Disconnect the negative battery cable for 30 seconds to 1 minute. This will cause the pcm to re-set it's memory.

If you car does start after this, it may drive a little weird after. This is normal. The PCM has to re-learn what is normal for your car, and adjust itself. This can take a few days.

Posted on Aug 05, 2008

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U messed sumthing up bad i could tell u what it is though

Posted on Jul 29, 2008


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Posted on Jan 02, 2017

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Truck does not start reads code 12 spark seems to be of and backfires when I try to start

what engine? size? 22R 22RE or 3F-E? 3VZ-E?
never work an car with out knowing what engine and if old EFI or carb.
look at it , in USA the under hood sticker clearly states engine in car.
does your motor have a timing belt for the cam>?
ever change it every 60K,,, oops////
on old cars ,and this one is.
I always check compression,, at WOT, (wide open throttle)
if 80psi the cam slipped. if 150PSI x4 its a winner

next is spark, if the cam slips, BTW< the spark timing is GONE
OUT TO LUNCH timing, no , dont change it ,fix the belt first.
and back firing is caused by bad timing....
22R and 22R-E engines have a cam chain.
but seen many cars with a screaming chain, owners ignore it....
seen them slip too.. as hard as it is to believe. (im never shocked)

#2, do that 60k tuneup for spark and filters now, amazing what a simple tune up does, with new spark wire, in winter they short.
and air filter and fuel filter,

spark timing> spec:
At idle the 22R-E should read 10-14deg BTDC, 3VZ-FE should read 8deg BTDC, and the 3F-E should read 12deg BTDC.
if way off, the cam is out of time. (no one messed with engine)

code 12
means the ECU found a dead sensor (spark) NE, G1 or G2
these are all sensors for spark, cam or crank or both.
the FSM covers this.
code 12 are loss of sensor for 2 second cranking
and is a bad sensor, not calibrated , or bad wire to it,, etc.
think about this. (no engine stated, so generic answers happen)
IF the cam is off time.
the CAM sensor is fibbing, as compared to the crank sensor.
so it would not be a suprise to me, that code 12 throw.

that is why i check spark timing first. then if way off
check compression 2nd, and if way off.
time 4
the cam end is exposed and timing verified.

if engine is interference type, is use a total different strategy.
do no harm, is first. (visual inspections of cam are first)

next time post the engine you have.
merry Chrismas and hope we find it fast.

Dec 24, 2013 | 1991 Toyota Pickup

1 Answer

Engine change

CEL glowing, did you connect a scan tool. and it shows DTC codes
for the CMP???, or is this a pure guess?, Cam Sensor bad.
elaborate , please
no country stated, do cant comment. as some countries didnt use. OBD2 until 2006> but the CEL still blow, running bad at cold or hot idle. your post really is that, MISFIRE at Cold only idle.
i bet all else is theories.
tell more get more.
get in car, tune key, CEL glows, start car, does CEL go out?
if not out, that means there are stored error codes, so scan it.

Nov 19, 2013 | 2005 Suzuki Liana 1.3

1 Answer

My 2002 pt cruiser died while I was driving first the oil light came on then it just died! I just had the oil changed 3 days prior to it dying some of the codes I received were 0340 1684 1685...

P0340 is cam position sensor. P1685 is for the key(has a chip in it) P1684 is battery has been disconnected. If the engine will still crank then codes P1684 & P1685 are probably old codes. So if the car will still crank, lets forget about those codes and focus on P0340 A bad cam position sensor will cause the engine to die and not allow it to start back up. Replace the cam position sensor and clear the code and the car should start up.

Oct 16, 2012 | Cars & Trucks

1 Answer

Olds starts but it takes 7 or 8 cranks befor it starts and check engine light is on seems like a air problem ?

have the code pulled from the computer this may tell you were to start to diagnois your problem.this long crank time could be a fuel supply problem,like pump,filter,injectors or a bad crank sensor,cam sensor,etc.have the code checked first.

Sep 04, 2011 | Oldsmobile Intrigue Cars & Trucks

2 Answers

Trouble code p0340 engine truns over wont start

Possible Causes=
Camshaft Position Sensor (most likley)
MP signal circuit shorted to voltage
Tone wheel/pulse ring damaged
Sensor ground circuit open
5 volt supply circuit open
Irregular LAB scope pattern of CMP signal
Wiring harness intermittent problem
Stay signal from crankshaft position sensor

Jul 03, 2011 | 2000 Jeep Grand Cherokee

1 Answer

Hi My car engine just died on highway. Check engine light came on. Diagnostic showed P0340 CAM sensor error. Got it replaced but error still there. Got Fuel filter and the sensor on the engine Oil cae(...

The cam sensor is supplied a reference voltage by the engine computer and the cam sensor should generate a signal back to the engine computer above 50 rpm of the engine cranking. The problem could be a faulty purchased cam sensor (yes this happens sometimes although rare) fwiring connector problem at cam sensor or faulty engine computer.

May 29, 2011 | 2004 Chrysler Sebring

1 Answer

Got code 0302 i changed cam sencor do i need to re set code as it is still coming up

302 is misfire, cylinder 2. Did someone tell you to replace cam sensor? Bad advice I'm afraid.

Please see my tip at . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

Nov 28, 2010 | Ford Transit Connect Cars & Trucks

2 Answers

Po340 code will not start occasionally then engine light comes on and thats the code that shows

tht is a camshaft sensor code. you probablyhave a sensor just starting to go bad and when it does the truck won't start no more. if you want to look atthe wire haness going to the cam sensor and if it looks good thaan swap the cam sensor.

also if you give the size engine you have i can give you a test to do with a meter to check it. but most of the time if thevehicle is running you can't tell. it has to be broke to tet it. but to re assure you i istall alot of cam sensor nd also crank sensor. so it is a very common problem...goodluckand ask any more question you have.

Sep 25, 2009 | 2001 Jeep Grand Cherokee

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