Question about 2002 Chevrolet Express

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Misfire on cylinder seven and eight on a 99 chevy express van

Two opposing cylinders are not responding

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

davesmith_37
  • 94 Answers

SOURCE: cylinder 2 misfire on a 1998 chevy blazer

check your plug wires for tears and dont overlap them

Posted on Feb 27, 2009

  • 12 Answers

SOURCE: 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

Posted on Apr 12, 2009

  • 90 Answers

SOURCE: I need a belt routing diagram for a 5.7 l 99 3500

Illustration 7-4 http://www.daycoproducts.com/daycoweb.nsf/Serp%20Rout%20Guide%20Illus.pdf

Posted on Jan 01, 2010

  • 12 Answers

SOURCE: just got 2002 chevy cavalier ls check engine light

RECHECK#2 SPARKPLUG, PULL IT OUT AND INSPECT THE GAP TO MAKE SURE IT'S NOT BENT SHUT, IF PLUG IS OK MAKE SURE WIRE BOOT IS ON SECURELY, IF THATS OK THEN SUSPECT A FAULT COIL.

Posted on Mar 29, 2010

  • 59 Answers

SOURCE: My 2005 Chevy Equinox LT

Have you done a compression check? I had the same problem on an S-10 Chevy pick up. Found that # 3 cylinder had low compression due to a burnt exhaust valve. No more problems after having valve job done on the engine.

Posted on Feb 16, 2011

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It is possible it is in the passenger side exhaust manifold.

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I have 2003 chevy express cargo van 2500 w/4.8 v8 has engine code p0300, seems like entire passenger side of motor not firing , although there is spark at each coil pack, i can pull each plug wire of on...


Trouble Code: P0300

Multiple Cylinder Misfire Detected
Possible Causes:


Base engine mechanical fault that affects one or more cylinders.EGR valve is stuck open or PCV system has a vacuum leak
EVAP system problem or the EVAP canister is fuel saturated
Fuel metering fault that affects more than one cylinder
Fuel pressure too low or too high, fuel supply contaminated
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MAF sensor contamination (it can cause a very lean condition)TSB 03-06-04-030 contains a repair procedure for this code

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I have a 1996 chevy express conversion van 5.7 liter I have misfire in all cylinder after the truck is warmed up I have new plugs cap rotor wires new o2 sensor. o2 sensor has been changed 3 times in 3...


No, the catalytic convertor does NOT sound right.
Normally with a random misfire a tune up takes care of it. What has also caused a misfire on those early motors is the popet injectors. They were prone to having problems and have been updated back around 2000 or so. But usually its a cyclinder or two or three or... misfire. All popets going bad is unlikely.
Might try changing the fuel filter and maybe checking pressure. Just the key on pressure should be 60-66psi. While running it may be around 60 and a snap of the throttle will make it rise to 65 or so.

Oct 27, 2011 | 1996 Chevrolet Express

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IF YOU GOT CYLINDER MISFIRE.OR OPEN FUEL INJECTOR.THAT WILL CAUSE THE PCM TO ENRICHEN FUEL MIXTURE.TO ADJUST TO DEAD CYLINDER.WHICH ACT AS A LARGE VACUUM LEAK.THATS WHY YOUR EXHAUST TAIL PIPES HAS A RAW FUEL SMELL AND WHITE SMOKES.

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Check engine light for 04 express 2500 van


Yes that is correct.There is also a coil that fires the spark plug for each cylinder.There are specific tests for each component so you can find out which part is bad.compression could also be an isue not likely if the problem came all the sudden.

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1996 Chevy Express 1500 w/5.0 bogging only when warm.


The cylinder 7 misfire is likely a symptom of the problem, not the problem itself.

Typically, the catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream 02 sensor reading should be fairly steady. Typically the P0420 code triggers the check engine light if the readings of the two sensors are similar. This is indicative of (among other things - such as faulty sensors in the "emissions loop") a converter that is not working as efficiently as it should be.

I do not believe that it is a problem with a valve/head gasket or cam.

Jan 13, 2009 | 1996 Chevrolet G10

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