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Need some help with determining cause of P0300 code in 08
Need some help with determining cause of P0300 code in 08 Tahoe … read more
rpmdiag
rpmdiag
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42 psi on fuel pressure on the rail. 2003 Suburban, 5.3 Flex
42 psi on fuel pressure on the rail. 2003 Suburban, 5.3 Flex fuel. How do I determine if it's the regulator vs. the pump. Getting a P0300 code, slight miss at idle. Only varies 50 to 70 rpm on scanner… read more
Gary
Gary
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Vocational, Technical or Trade Scho
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P0300 multiple random misfire code. I'm not sure how to find
p0300 multiple random misfire code. I'm not sure how to find out which cylinder is misfiring … read more
Roy
Roy
shop foreman
Associate Degree
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I have a 2008 chevy tahoe flex 5.3 keep getting p0300 and
i have a 2008 chevy tahoe flex 5.3 keep getting p0300 and p0174, after engine replacement and possibly codes were thrown prior to replacement … read more
GM Bob
GM Bob
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Chevrolet Tahoe 4x4: I have a 2003 Tahoe with a 5.3 flex fuel
I have a 2003 Tahoe with a 5.3 flex fuel engine. For 2.5 years now it INTERMITTENTLY idles and runs rough up to about 1500 rpm, and throws a p0300 code. I've done the usual and expected; changed all p… read more
Gary
Gary
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Chevrolet Tahoe 4x2: Hello, I have a 2003 tahoe showing po300.
Hello, I have a 2003 tahoe showing po300. looked online for variuos problems and items to check. Replaced the plugs. Checked fuel pressure. shows 51. Sprayed chemtool all around the intake just after … read more
Mike S.
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2008 chevy tahoe 5.3. no power to fuel pump fuse or relay.
2008 chevy tahoe 5.3. no power to fuel pump fuse or relay. everything else has power around it. The fuel pump works with direct 12v to gray wire. changed the fuel control module swapped the distributi… read more
Gary
Gary
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Vocational, Technical or Trade Scho
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1999 Chevy Tahoe: p300..Misfires..running rough..idle and hesitates
Hello, I have a 1999 Chevy Tahoe with a 5.7 Vortex, it is coding P0300, Random Multiple Misfires, no other codes. It is running rough on idle and hesitates really bad. I can hear slight backfires at s… read more
GM Tech (Cam)
GM Tech (Cam)
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Vocational, Technical or Trade Scho
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2002 chevy: cause a random misfire..trouble codes..p0174 p0171
What would cause a random misfire, system to lean bank 1 and 2? The trouble codes are p0300 p0174 p0171 on a 2002 chevy 5.3… read more
hauto
hauto
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2003 chevy: check engine light..misfire..injector..fuel filter
2003 chevy silverado check engine light on and flashing. pulled codes stared as misfire 7 and 2 then just 7. replaced injector,plugs and wires, coil pak and fuel filter and fuel press. regulator. stil… read more
GM Tech (Cam)
GM Tech (Cam)
Chevy Technician
Vocational, Technical or Trade Scho
16,004 satisfied customers
2003 Chevy: vin..scanner..number 1 cylinders misfiring..idling
Hello, I have a 2003 Chevy Express 1 ton 6.0 vin U. I'm getting a P0300 random misfires. I put it on the scanner and see number 6 and number 1 cylinders misfiring only at 3k rpm, idling there is no mi… read more
cartech
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master tech
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2002 Tahoe Misfire Detected Code P0300 I have an 02 Tahoe
2002 Tahoe Misfire Detected Code P0300 I have an '02 Tahoe flex fuel 4x4 5.3l that has developed a misfire/loss of power. The problem only happens at WOT above ~4500 rpm. Service engine soon light fla… read more
Daniel
Daniel
Lead mech
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My 2000 Chevy S10 2.2 liter flex fuel engine began being very
My 2000 Chevy S10 2.2 liter flex fuel engine began being very sluggish at 50 mph last thursday. withinh 15 minutes it developed a very severe miss in the engine. My scan toll says "multiple cylinder m… read more
John
John
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tahoe: cyl..idle miss goes away, have changed plugs wires..injector
i have an 05 tahoe, p0300 dead miss on cyl 4 only at an idle, over idle miss goes away, have changed plugs wires and that injector.… read more
Ironmike
Ironmike
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2003 chevy tahoe: cylinder..swapped coils, spark plug wires
I have a 2003 Chev Tahoe, 5.3 vortec motor. I keep getting random misfire in #3 cylinder. I have swapped coils, spark plug wires and replaced spark plug, it didn' t seem to make any difference. Any su… read more
Gary
Gary
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Vocational, Technical or Trade Scho
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2003 gmc: changed plugs..fuel filter..swapped coils
I have a 2003 gmc sierra with a 6.0, I am having random multiple misfire on 7 and 8 more on 8 then 7 have changed plugs wires fuel filter and pump swapped coils around with no change in misfire locati… read more
Chevy
Chevy
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Chevy tahoe: fuel pressure 58 psi, new bank 1&2 sensor..maf..fuel trim
06 chevy tahoe p0171+p0174 set within 45 sec. fuel pressure 58 psi, new bank 1&2 sensor 1 o2s tried maf. long term fuel trim shoots to 25 short term stays 3-5, also new intake gasket.… read more
fix that car
fix that car
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488 satisfied customers
1999 cadillac deville: module, coils, wires, plugs, fuel presure
P300 code on a 1999 Cadilac Seville STS Have checked module, coils, wires, plugs, fuel presure, and compresion. It only has misfires on 2,4,6, and 8 no misfires shown on 1,3,5, and 7.… read more
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Meet the Experts:

GM Tech (Cam)

GM Tech (Cam)

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GM Grand Master Technician 2007. 14 years experience.

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Gary

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Tim's Auto Repair

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Dave Nova

Dave Nova

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John

John

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Don - Mo Lurch

Don - Mo Lurch

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Jerry Newton

Jerry Newton

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ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.

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