Question about 1997 Toyota Tacoma

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Missfire I have A 97 tacoma with all 4 cylinders miss firing .I have replaced the o2 sensor ,pressure regulator ,fule filter,pvc valve, plugs and wires

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Have you replaced the coil yet? I assume by all 4 cylinders misfiring you mean P0300 Random Misfire? It could be a number of other things - a faulty fuel injector, coil, etc. Read this article for more info on random misfires - http://www.obd-codes.com/p0300

Posted on Dec 14, 2008

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I don't have a solution but I can tell my story on code P0300. 2002 Buick Rendezvous. What I have replaced so far that did not fix the misfire problems are 1. EGR valve, 2. throttle position sensor, 3. Idol air control valve, 4. The rear crank position sensor, 5. the control module under the coil packs, and 6. the fuel filter. So far it seems to run a little better when I unplug the EGR valve but that is only temporary. I still have the stumbling random misfire but not all the time. It comes and goes. Currently it will run smooth and strong for a while, maybe 10 miles or so, then it just looses power. When I back off the gas it smooths out a bit then as I accelerate again it misfires all over the place with the tach jumping up and down. It will do this sometimes for a few seconds to a few minutes then smooth out and run strong and smooth again. The a mile or so down the road it will misfire again all over again. Sometimes it goes for 30 miles without a misfire at all. I have to question how the cat could cause this issue as mentioned in the list of possible causes.

Posted on Apr 24, 2012

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1 Answer

Where if fuel pressure test port 1990 oldsmobile cutlass ciera 4 cylinder - O2 sensore read code 44


The internet is filled with all sorts of OBD1 Code 44 info to read

Bad Egr Valve --letting unmetered air in
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Vacuum leaks anywhere
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You'd have to tee into the fuel filter to use a fuel pressure gauge,
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You changed a fuel pressure regulator-- in the throttle body?

You won't see much with a scope on that system, if you scope
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That's Random or multiple missfire code. Have you checked for proper fuel pressure? Improper fuel pressure will trigger this code if it's too low, thus causing a lean mixture in multiple cylinders.

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your injector spider it look like a spider under the planium its the injector pipe that are broken if you check everything else that it you need to remove the planium you will see that injector module be carefull loosy plastic clip holding those injector in they break easy let me no and thanks for using fixya

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My 1995 Toyota Tacoma 4 cylinder 2.7 liter automatic 4wd is missfireing on three of the four cylinders. The miss fire is very random happening more and more frequently. I have good compression and timing....


Pull codes from OBD computer go from there. Could be other problems, check fuel pressure, All electrical connectors- loose, water, dirty, ground connections, etc. Could be a failing sensor. How do you know its missfiring on 3-4? one or two cylinders would be a really bad shake. Creek is to deep stay out of creek. Good luck!

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P0308 cylinder 8 misfire detected? How to repair?


Fuel injector cleaner commonly has a low success rate, and will not help if it's more than one cylinder that is missfiring. The fact that you have a "rattle" noise, leads me to beleive the engine is not receiving fuel on one or more cylidners. If it is all the cylinders, than the fuel pump may be the culprit, or the fuel pump circuit. But if only one cylidner is missfiring than it is a possibly an injector. A code P0300 refers to all cylinder missfires, and any code between P0301-P0308 distinugiushes a particular cylinder.

Misfiring
1- a general electrical tune-up (spark plugs, wire set, cap & rotor) is a basic start to cure this issue. Wiggle the dist shaft while you are in there, if you have one.
2- Then a good carbon cleaning / throttle-body cleaning.
3- Vacuum leaks at any of the hoses that connect to the Intake manifold; especially the MAP sensor connection.
4- If that does not help then the O2 sensor could be bad or drifting.
5- Funky coil/coil-packs
6- Theoretically a microsecond glitch in either the cam or crank shaft sensors would cause this, but I am not aware of this as a typical cause.
7- Lastly a funky PCM but again it is not common for this to cause miss-firing.

Note for the V8 then also:
a) bad erg valve (this dilutes the combustion gases and hence raises the combustion temp
b) a leaky plenum/Intake manifold gasket. Leaking Intake gasket symptoms

Also can check the TSB 18-48-98 Ignition System Cross Fire/Secondary Ignition Wire Induction (Complete Version )

Hope help with this (remember rated this). Good luck and have a nice day.

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3 Answers

05 Impala missfire code 301 have changed


check intake for vaccum leaks,the gasket also and egr valve, thats alot of parts to have replaced without diagnosing first, if there are no fuel leaks and you said all injectors were replaced then you have a defective fuel pump, also these engines had misfire problem because of dirty injector but you replaced them so count that out. good luck.

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I doubt if it is the pistons or PVC valve. It is either a fuel or a spark problem. First check the spark and make sure it is good and strong, if you have a strong spark the problem has to be fuel flow related, maybe the fuel pump or the injectors.

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replaced fuel filter yet ? have you checked fuel pressure and the fuel regulator

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