Question about 1997 Chevrolet Blazer

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  • Anonymous Oct 29, 2008

    • p0300 random miss fire switches to p0302 cyl 2, replaces cap and rotor 4 times last month,along with plugs and wires twice, fuel preasure regulator, fuel filter, mass air flow, throttle pos sens, cam shaft sensor, spyder injecion

  • Anonymous Nov 03, 2008

    My wife has a 1997 chevy blazer. It has 102,000 miles. It is in good shap. But now it has a miss that comes and goes. New plugs, fuel filter? no change?????

  • lawnman585 Nov 08, 2008

    2004 cavalier with 81000 miles. Getting a P0300 code and car runs rough. Ran cleaner through fuel, replaced fuel filter, replaced plugs and wires, replaced coil pack and air filter. Car still runs rough so took it to the shop and they said it sounds like a vaccum leak but could not give me any idea on a cost to fix it so I sprayed the entire intake and components down with carb cleaner and can't find anything. Any help would be great.

  • tristude1 Mar 03, 2009

    97 chevy tahoe same problem changed plug wires , plugs, air filter, oxygen sensors,distributor cap, rotor, air flow sensor, fuel filter, fuel pump and two vacuum lines. it still has a interupted idle.



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Have the injectors cleaned up and chek for damaged or worn distributor shaft gear, that could be your main problem.

Posted on Jan 13, 2010

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Try changing the fuel filter

Posted on Aug 04, 2008


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My 06 Jeep Liberty is reading its having multiple misfires the check engine light and traction control light is on in the dash truck starts and runs but pulls really sluggish my coils are firing ecu ?

why not say the code, let us decide what they mean.
P0300 code, in fact post all DTCs not just one if more......!!!
this code means MISFIRE< (that sluggish is that , misfiring)
cause by bad COMBUSTION.

1: bad spark ever to a tuneup? ever?
2: bad compression on the P030x (what is x) cylinder.
3: bad injection to P030x cylinder.

do post all codes. first.

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My 1995 Mazda B2300 Truck, 2-dr. 4cyl. When driving up hills mostly, it engine sounds like it's dieseling, loses power, and the oil gauge goes crazy. Help?

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My truck loses power going up hills

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My 87 caprice starts and idles fine but loses power on hills why

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2003 gmc jimmy on hills loses power check engine blinks then stalls upon restart performs great runs well on flats and even not steep hills .

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hope it helps

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which engine? there are many.
can be 50 things
300 means random misfire on all cylinders.
it really means all cylinder have weak HP, weak power, weak combustion energy levels !

The ecu actually measures crankshaft acceleration rates (geekspeak)
in lay terms this means (btw 300s never lie, it's REAL misfire)
there is one exception a loose timing belt or cam chain. can trip 300s.

in no order ever.

1: bad spark to all cyl.
2: low compression to all cylinders (cam timing off, melted CAT)
3: bad fueling to all. (EGR stuck wide open , engine stalls?)

but can be 50 things, so its best not to GUE$$
what we do is conduct simple tests.
first is do the 60,000 mile tuneup. do that its cheap, and works in most cases.
1: tuneup time.sparks and filters both. fuel and air.
2: compression test, and vacuum tests. at WOT,. both. ask for data.
3: check cam timing. if compression fails on all cyl.
4: i scan the ECU looking at fuel trim and closed loop working, ask.

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1 Answer

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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1 Answer

1990 toyota truck 6 cyl. automatic, wont start loses power , can't go up hills when warmed up

Hi Eric, Have a diagnostic scan carried out and the catalytic converter checked for blockage. Regards John

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