4 cylinder misfires in 5 minutes, need some help
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4 cylinder misfires in 5 minutes, need some help
As the new guy on the website, i don't want to write too much, but i was looking around and could not find anything, and in need of some help I came to a store on my car was running good, came out 5 min later and the car started to idle very roughly, as i am awaiting my ross-tech tool i couldn't make a thorough check so i used my cheap obd2 scanner, and this is what came up
P0300-P0304 , P1423, P1411 also when you start to drive the check engine light starts to blink, i cleared the codes and rescanned it and the P0300-04 came on?
Where should i start looking first? Sparkplugs,coils?
P0300-P0304 , P1423, P1411 also when you start to drive the check engine light starts to blink, i cleared the codes and rescanned it and the P0300-04 came on?
Where should i start looking first? Sparkplugs,coils?
AudiWorld Super User
Joined: May 2010
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From: East TN
Those are misfires on the passenger's half of the motor.
Need to know what year car and motor. The ignition system changed from 2000 on.
I'm guessing that it's 99 or before and there's a problem with the "power output stage" that sends fire signal to coils 1-4 on bank 1 (passengers side).
If so, I'd at least check for good connections or even switch with other one (for bank 2...mounted under #1, same side) to determine if it's that part failing.
Need to know what year car and motor. The ignition system changed from 2000 on.
I'm guessing that it's 99 or before and there's a problem with the "power output stage" that sends fire signal to coils 1-4 on bank 1 (passengers side).
If so, I'd at least check for good connections or even switch with other one (for bank 2...mounted under #1, same side) to determine if it's that part failing.
AudiWorld Super User
Joined: May 2010
Posts: 2,611
Likes: 11
From: East TN
Well, on a 2000 all coils and injectors are controlled by the ECM and all coils have their own power output stage. Nothing in that system should only effect one bank of cylinders...and no way you suddenly lost those 4 coils at once.
I'd look elsewhere, as A8CT suggested, even possibly fuel pump(?)..the fuel rail on that side may have just lost pressure first(?).
No other theory yet, since no other codes.
Your other 2 codes were for an emmissions system (aux air inj) that should not cause such a symptom. Critical codes (like misfires) trigger instantly...all other codes take 2-3 driving cycles to trip again.
Have you restarted the car and gotten the same misfires? Maybe try adding just a gallon (or even a little less) of gas to the tank...this will temporarily reprime the pump...and start again. If it runs smooth at first then returns to misfires, it might tell you "pump"...not THE definitive test, but sometimes indicates a pump that has not totally failed yet.
Also look for obvious wiring problems on the passengers side of engine, plus hoses, etc on that side. Outside chance of wiring from ECM or even moisture in the ECM...inside of box in the fresh air plenum under the hood on passenger's side.
I'd look elsewhere, as A8CT suggested, even possibly fuel pump(?)..the fuel rail on that side may have just lost pressure first(?).
No other theory yet, since no other codes.
Your other 2 codes were for an emmissions system (aux air inj) that should not cause such a symptom. Critical codes (like misfires) trigger instantly...all other codes take 2-3 driving cycles to trip again.
Have you restarted the car and gotten the same misfires? Maybe try adding just a gallon (or even a little less) of gas to the tank...this will temporarily reprime the pump...and start again. If it runs smooth at first then returns to misfires, it might tell you "pump"...not THE definitive test, but sometimes indicates a pump that has not totally failed yet.
Also look for obvious wiring problems on the passengers side of engine, plus hoses, etc on that side. Outside chance of wiring from ECM or even moisture in the ECM...inside of box in the fresh air plenum under the hood on passenger's side.
Last edited by silverd2; Jan 27, 2011 at 02:09 PM.
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Thread Starter
AudiWorld Member
Joined: Oct 2010
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so i did check for any problems where the ecm is, everything looks dry, no wire or hose disconected. I also put in a little less than a gallon of gas and started it up for a second i thought the idle was gone but it was still there. also wormed it up and drove a little on it, cleared the codes again and rescanned them and only
P0300-P0302 came up, only 2 cylinders misfiring, also when i rev the engine the left side of the engine gives out a rattling noise at a higher rpm on
any guesses what it might be?
P0300-P0302 came up, only 2 cylinders misfiring, also when i rev the engine the left side of the engine gives out a rattling noise at a higher rpm on
any guesses what it might be?