Question about 1996 Chevrolet C2500

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I got 96 chevy c2500 pickup, 5.7 vortec, engine light is on, it is giving the codes P0155, P0174 and P0300 which is a misfire, so How do i fine the misfire source and could the misfire causing the other codes to appear which is o2 heater circuit bank 2 sensor 1 and fuel system too lean bank 2.

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Check your bank 2 plugs for colour (do they look hot like they running hot ). Check you EGR Exhaust Gas Recirculation valve (looks like a 80mm diameter spaceship with a vacuum line to the top of it) If this remains closed the engine runs very hot and causes misfire. Possible causes are EGR not opening are 1) perforated diaphragm 2) encrusted valve stem 3) clogged exhaust gas feed pipe. A quick check for function: run the engine and remove the vacuum tube. The engine note should change as the tube is connected and then disconnected. Also pushing on the underside of the EGR with your fingers to lift the diaphragm to open the valve should also result in change in engine note. If its not working just disassemble the EGR and clean with carb cleaning spray, also clean the exhaust gas feed pipe likewise.

Posted on May 04, 2010

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97 chevy 1500 sputters at idle in gear can feel it a little while driving no cat. past 2 years run bank1 lean code plugs clean HELP


If the engine is misfiring the check engine light would be on and blinking and the engine control module (PCM) would store a fault code or codes for the cylinders that are misfiring. A lean code will not cause a misfire unless the engine has a vacuum leak most often at the intake manifold gaskets. A misfire code looks like this:

P0300-P0306 for 6 cylinder and P0300-P0308 for a V8.
P0300 indicated a random engine misfire, this can be caused by all kinds of issues.

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Starts up but runs rough, exhaust smells, and when you give it gas it wants to shut off.


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2001 Chevy Blazer (4dr / 4WD / 4.3 Vortec) with Code (P0300B)


P0300 is a Random Misfire code. Try cleaning the Mass Air flow sensor with a electronics cleaner gently dropped on it and let dry(NO COMPRESSED AIR) before plugging back in and using vehicle. there may be a video of this online elsewhere. Please don't hesitate to ask questions, there is no such thing as a dumb question. Please let me know how this goes so we may troubleshoot this together.
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I HAD DTC P0171 nd p0174 my truck is 1,500 5.7 engine can toy help me o n this one


the three failure codes you retrieved point to a vacuum leak from intake side of engine, check intake manifold with some engine starting fluid sprayed from outside around all sealing gaskets and if engine speed goes up or down noticably that would be your leakage area, also the mass air flow sensor being dirty would cause tthat and last a faulty fuel pump, not giving enough pressure but ok with volume amount, both p0171 and p0174 indicate a lean condition from each bank.the p0300 is random misfiring of cylinders, not one particular, it is a by-product of a lean burning condition.

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3 Answers

2003 Ford Ranger 4x4 extended cab- diagnostics checked and got these codes- P0171, P0174, P0300, P0316. Can you tell me what they mean?


P0171------ system too lean bank#1
Po174------ system too lean bank#2
For these 2 codes, try cleaning the maf sensor (mass air flow), that is mounted in the big black hose that goes from the air filter housing to the throttle plate, if it is dirty, that will cause those 02 sensors to send a signal to the computor to lean the air fuel mixture. If cleaning it doesn't work, the sensors will probably need changing.
P0300---- Random/multiple cylinder misfire
P0316---- Cylinder misfire at start up---- first 100 revolutions.
On those 2 codes, you have to do some testing to find out why there is a misfire.
Possible causes:
dirty/malfunctioning injectors
weak coil pack
fowling spark plugs/wires
Low fuel pressure

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3 Answers

I own a 96 chevy k1500 5.7 l vortec and have a no 5 cyl misfire


It could be a faulty fuel injector, try running a fuel injector cleaner through your fuel system. At worst the poppet nozzle has gone bad and will need to be replaced, you can buy the poppet nozzle it self individually at Auto Zone or buy upgrade MFI system which is much better and less pron to fuel leaking room a cracked poppet line or nozzle which will cause what you have described.

Feb 03, 2010 | 1999 Chevrolet Silverado 1500

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means you have multiple misfires (po300) the other codes are lean codes, possiable tune up , bad injector, fuel pump,

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1 Answer

200 Chevy Tahoe 5.7L


Do you have any engines codes like P 0300. Sounds like ignition coils ,check input wires to coils if okay replace both coils.I have seen this few times

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1 Answer

My 96 GMC sierra has a random misfire


couple of things, did you actually gap the plugs yourselfor did you go on the assumption that they are pre gapped ? are the lead wires all in the correct firing order ? Is it possible a vacuum line got dis-connected ? I would also check the cap and the rotor.

Oct 27, 2008 | 1996 Chevrolet Suburban

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