Question about 1996 Chevrolet Blazer

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Random missfire. all the time. when driving on highway worse check engine light blinks code po300.

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Most likely to check the distributor cap and rotor. Pins can corrode pretty bad (greenish dust). If ok check the intake manifold gaskets for signs of coolant where they meet the cylinder head.

Posted on Jan 02, 2011

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Posted on Jan 02, 2017

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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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My 2002 envoy has a miss that just started==was driving on the freeway for about 40 miles @70 pulled n a station to get a drink ==started it back up and it started missing like a dead plug or coil i...


2002 Envoy sle 4.2 L straight 6. Random misfire(PO300). After erasing codes for several days, I finally took my car on the highway and ran it at high speed(70+) for about 4 to 5 miles. Check engine light came on as before but this time it gave me(PO305). Random misfire cylinder 5. So I switched coil 5 with coil 2. Went back out on the highway and repeated as before. This time it gave me(PO302). This was telling me I had a bad coil. Replacing one coil pack solved the problem. The professionals told me low fuel pressure would not give me random misfire, but rather a O2 code because the engine is running lean. Thank you------------------------------------ thank you very much.

Jun 26, 2012 | 2002 GMC Envoy

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05 ford escape misses usually while accelerating. Sort of like a lunging problem when a fuel filter is bad. Happens maybe 8 times in a 25 mile drive. This problem prompted me to replace Spark plugs/fuel...


It is more likely the spark plug coils which go bad a little at a time, so you start to feel misfire randomly and often times it gets worse in wet or high humidity weather. If your engine service light blinks, this is sure sign of coil near the end of its life, happened on mine that way, lived with the missfire for a month or so, then it got to point engine light blinked, and if you read codes it will tell you which cylinder is misfiring, so visit local Autozone or other like O'reilly and they will read code for free, whereby Ford dealers will charge you. Easy to replace the coils, so I would bet that is your problem.

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I have a 99 malibu with a 3.1L engine. my check engine light came on and then started to blink, after scanning the car with a code reader it showed a PO300, PO113, and P1404. after reseaching the...


the flashing light is telling you the engine is miss firing, not that there is fuel in the exhust a miss fire is the only thing that will cause the light o flash the P0300 is a random misfire so i cant tell you witch cylinder but replace the coils that should take care of it....good luck

Jul 29, 2011 | 1999 Chevrolet Malibu

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What is an code po300 and po420 and what do i need to do i have an 2002 nissan altima


The p0300 code is a random missfire code sometimes caused by bad spark plugs and wires, if you have not done a tune up, it's time for one. now, the p0420 code is for catalyst efficiency below threshold, basically, your catalytic converter is bad and may need to be replaced. Sometimes repairing the random missfire can eventually clear the p0420 code. your car is not burning fuel properly, therefore the catalytic converter is getting dirty. Also, if you notice blue smoke coming out the tail pipe, then that's the cause for a failing catalytic converter as oil is getting to the combustion chamber and being burned off through the exhaust.

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I have 1999 318 4x4 dakota with fault coads


These are misfire codes.This means that your vehicle is missing.The 300 is a random misfire and the 305 is for cylinder 5,and the 306 is for cylinder number 6.Check the plugs if they are good then you could have bad coils.They are top of the plugs.Hope this helps.Good luck.

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Engine lights comes on checked code and po300 comes up


that's a multiple cylinder missfire code(random). Has it been a bit shaky recently? if you haven't performed a tune up recently, it's time to do so. replace plugs, wires, and in some cases, the distributor cap and rotor if equipped.

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2005 chevrolet k3500 6.6 duremax diesel with check engine codes po229 po300 po303 po304 came up after changeing fuel filter with water in fuel light came on also added fuel conditoner to fuel truck idles...


PO229 indicates tps circut inttermitent.
Po300 303 and 304 indicate missfires on cyl 3 and 4.. Was the fuel filter primed before starting the engine? If not ,remove and reinstall filter. Then prime filter with pump that is on fuel filter adapter. Once this is done restart and verify o/k

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Service engine light blinks,code read out of po300


Code p0300 is the code for "random missfire detected". The "check engine" light is flashing to warn you that severe damage is being done to the catalytic converter.(very expensive)..

Apr 27, 2009 | Chevrolet Tahoe Cars & Trucks

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