P101 thats incorrect flow from the maf 304 that cylinder 4 misfire had troble this moorning with a code 101 no power 80 km top the catalytic convertor was block cchange it run great now dont forget your 304 code is misfire thats mean the gas that goes in that cylinder doesnt burn it goes in the catalytic converter and it make the converter red hot to melting point let me no brian p.s the 101 code i had this moorning was on a gmc safari with 4.3 liter good luck
SOURCE: Misfire in 97 voyager,P0300 and P0304,HELP! Need 2 get inspection
I'd have fuel pressure checked, and at the very least, replace fuel filter. Not unusual to get multiple misfire codes due to low fuel pressure, thus starving cylinder(s), and causing the misfire code(s).
SOURCE: I have gotten a P0306 Cylinder 6 Misfire Code on a
I investigated this for over an hour while tossing things around in my head and truly think that you need to have your O2 censor checked along with your converter. One probable cause to your misfire could very well stem from your catalytic converter due to an O2 faulty etc.etc. Why not try a smog shop before tearing that engine apart any further and replacing any unnecessary gaskets. Thats a tight engine in my opinion and unless you really mistreat it, I would bet on it at race day. Have you recently been in a fender bender? Let us know cause that might change my advice.
Check the compression on that cylinder. The most probably cause is a faulty fuel injector. It could be partially blocked, with crud. An inexpensive fix might be to purchase a can (bottle) of fuel-injector clean, and put some higher octain gas in for one (1) tank-full. It might clear the problem without pulling the injector. Also check the wiring going to the injector. It could be the wiring connector going to the plug.
SOURCE: random misfire cylinder 3
Smoke test entire vehicle for vacuum leaks
You don't have any idea where the misfire
is from, at this point,find out
You installed parts
That is not what you do,you diagnose & find
the cause of the misfire,no parts involved there
You don't have the professional tools or software
at home, to diagnose without wasting time & getting
no where
Could have a bad intake gasket or mechanical problem
in one cylinder
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