Question about 1996 GMC Sonoma

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High rpm at start up un 1996 gmc sonoma

If the cam position sensor goes out would that make my engine run at high rpm at startup

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No it wont start if the cam sensor goes out check to see if there is a vac line off somwhere 9 times out of ten its a vac line

Posted on Dec 20, 2008

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350 V8..revs itself and idles at higher rpm..tap excelerator and goes down to normal


if it is a carby engine then check the settings of the automatcic choke and the throttle cam screw settings
it works in a manner so that when you press on the accelerator the automatic choke flips a cam around and the idle speed screw rests on that cam giving a high idle speed until the engine is hot enough not to need a choke at which point the cam is held clear of the idle screw
if efi engine run the fault codes to check for problem accelerator position sensor or throttle position sensor.

Sep 04, 2015 | 1980 Chevrolet Corvette

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2005 Dodge Ram 1500 4.7 Engine. Starts fine, Idles fine, but when engine shifts into high gear and RPM lowers engine runs really rough under load


Have you checked for a broken valve spring. Repaired a dodge engine with the same running issue as you have described and it was a broken intake valve spring.

Feb 22, 2015 | 2005 Dodge Ram 1500

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Toyota Yaris D4D Problem Scanner P0388


wow, no year car, nor engine type. stated.
does engine run? this is first ,no?
how many miles on it, 50k, 300K? what?
has the cam change been making noise for ever?

it means the input signals from that sensor is bad.
that means its bad or the wires connecting it are bad.
1nz-fe engine? 1.5L
if rpm is limited to 3000 rpm the ECU is in limp home mode.
no other codes, does it run at all ?

388s,
the ECU brain, what it means when 388 are thrown.?
it means the ECU thinks the engine is spinning but
the Crank sensor is producing odd signals.
since you failed to say , if engine runs or not, i must guess.
it can also mean the Cam sensor is not agreeing with the crank sensor.
1: sensor dead. (wires first)
2: sensor misfiring (wires usually)
3: The ecu can report 1 misfire in 10 from both sensors !

crank pulley is right side of car
facing it, the sensors is at about 7PM
check wires there.? yet?

post more facts and we can do test.
top fact, does engine run and run right>?

Feb 22, 2014 | Toyota Yaris Cars & Trucks

1 Answer

1997 Cadillac Seville Engine races 4000 RPM on startup


run fault codes and check for accelerator position sensor problem Check for MAP/MAF sensor faults.

Nov 17, 2013 | Cars & Trucks

2 Answers

Astra h 2004-2009 error code p0234 boost pressure positive deviation


sensor failing or coming lose and not being able to read engine movement i think they have sensors for tdc and bdc so would check them.on petrol engine they are cam and crank sensors. they fail and sometime don't though up a code until completly gone and then the engine will not start.

Feb 12, 2013 | Vauxhall Cars & Trucks

1 Answer

Car blows white smoke at high rpm runs bad


hmmm...This kind of problem usually is due to cam shaft/valve timing issues. Sometimes, the cam shaft is not properly positioned and is not in sync with the distributor thus the exhaust valves open early releasing unburnt fuel. This will cause the engine to definitely run bad.
I suggest that you try to adjust your engine's timing first (cam and distributor) and then see the results. Also, remember that there is a limit to the rpm that an engine must do- about 6,000rpm is enough for high or max hp. Another information, a camshaft will only work best at a given rpm range so if you run your engine too low or too high, the engine will not work properly. In fact, there are special cam shafts for engines intended to run at high rpm while sacrificing lower rpm levels (the engine runs grumpy at low rpm levels).
Worst case, however, is that white smoke sometimes indicates that oil enters your combustion chamber, this will cost an expensive rebuild if such is the fact.

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2 Answers

05 kia amanti with diagnostics codes p0350,p0320,p0300,p0302,p0303,p0304,p0305,p0306.skipping at times.when it does skip & misfire the rpm gauge goes crazy.this problem is not consitant


Generic OBD II Diagnostic Trouble Codes

DTC CODES P0300 to P0399

P0300....Random/Multiple Cylinder Misfire Detected

P0301....Cylinder 1 Misfire Detected

P0302....Cylinder 2 Misfire Detected

P0303....Cylinder 3 Misfire Detected

P0304....Cylinder 4 Misfire Detected

P0305....Cylinder 5 Misfire Detected

P0306....Cylinder 6 Misfire Detected

P0307....Cylinder 7 Misfire Detected

P0308....Cylinder 8 Misfire Detected

P0309....Cylinder 9 Misfire Detected

P0310....Cylinder 10....Misfire Detected

P0311....Cylinder 11 Misfire Detected

P0312....Cylinder 12 Misfire Detected

P0313....Misfire Detected with Low Fuel

P0314....Single Cylinder Misfire (Cylinder not Specified)

P0320....Ignition/Distributor Engine Speed Input Circuit

P0321....Ignition/Distributor Engine Speed Input Circuit Range/Performance

P0322....Ignition/Distributor Engine Speed Input Circuit No Signal

P0323....Ignition/Distributor Engine Speed Input Circuit Intermittent

P0324....Knock Control System Error

P0325....Knock Sensor 1 Circuit (Bank 1 or Single Sensor)

P0326....Knock Sensor 1 Circuit Range/Performance (Bank 1 or Single Sensor)

P0327....Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)

P0328....Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)

P0329....Knock Sensor 1 Circuit Input Intermittent (Bank 1 or Single Sensor)

P0330....Knock Sensor 2 Circuit (Bank 2)

P0331....Knock Sensor 2 Circuit Range/Performance (Bank 2)

P0332....Knock Sensor 2 Circuit Low Input (Bank 2)

P0333....Knock Sensor 2 Circuit High Input (Bank 2)

P0334....Knock Sensor 2 Circuit Input Intermittent (Bank 2)

P0335....Crankshaft Position Sensor A Circuit

P0336....Crankshaft Position Sensor A Circuit Range/Performance

P0337....Crankshaft Position Sensor A Circuit Low Input

P0338....Crankshaft Position Sensor A Circuit High Input

P0339....Crankshaft Position Sensor A Circuit Intermittent

P0340....Camshaft Position Sensor 'A' Circuit (Bank 1 or Single Sensor)

P0341 Camshaft Position Sensor 'A' Circuit Range/Performance (Bank 1 or Single Sensor)

P0342....Camshaft Position Sensor 'A' Circuit Low Input (Bank 1 or Single Sensor)

P0343....Camshaft Position Sensor 'A' Circuit High Input (Bank 1 or Single Sensor)

P0344....Camshaft Position Sensor 'A' Circuit Intermittent (Bank 1 or Single Sensor)

P0345....Camshaft Position Sensor 'A' Circuit (Bank 2)

P0346....Camshaft Position Sensor 'A' Circuit Range/Performance (Bank 2)

P0347....Camshaft Position Sensor 'A' Circuit Low Input (Bank 2)

P0348....Camshaft Position Sensor 'A' Circuit High Input (Bank 2)

P0349....Camshaft Position Sensor 'A' Circuit Intermittent (Bank 2)

P0350....Ignition Coil Primary/Secondary Circuit

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1 Answer

Just bought a 97 Aurora and had tires put on front and balanced. Now traction light comes on while driving and RPM goes to 0. After I pull over, it will run fine...What could be the problem?


OK, when the traction light or abs light goes on when driving then it could be a bad wheel speed sensor or traction control module. IF the RPM goes to 0, that may be an engine sensor problem or wiring to the sensor for the crankshaft position sensor or cam sensor.

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1 Answer

I have a 2004 Neon that begins to buck and hesitate at high rpm's


try pushing in on plugs on PCM, below and inboard from the driver's side headlight. The cam sensor goes to the bottom plug.

Apr 24, 2010 | 2004 Dodge Neon

1 Answer

Stalls while idling and engine "pops" at 4000rpm or better... im told it could be throttle position sensor, idle speed control motor, power control module, bad vacuum line, bad EGR valve, air filter, fuel...


Actually I am hessitant to respond to this one. The problem you are having COULD be many things, however my take is different than the others you seem to have. I believe that you are having timing issues caused by a Crankshaft Positioning Sensor, and/or Cam Positioning Sensor. Thesee are how the computer knows where they are and adjusts timing to make the engine fire at the correct time, thus it is called timing. The computer makes these adjustment is literally THOUSANTHS of a second, and if the sensor is off just a little especially at very high, and very low revolutions you will have a miss, which will at high RPM's "pop" due to it wanting to stall but because of the RPM's keep momentum, and pops but keeps running but at low RPM w/o that momentum, just stalls. I pray this helps you understand WHY I think you may have timing issues and why.

Mar 22, 2010 | 2003 Mercury Sable

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