Engine misfire, need new pcm?
#11
It could be that your remaining problem might be the CMP retard setting and/or distributor gear wear aggravated by a less than optimal distributor cap. New distributor cap could potentially temporarily cover up a problem, only to have it come back in a little while (or the new cap could truly be the cause - IMHO doubtful) - but it's all pure speculation without solid testing.
However, you have told me that the spark plug was black with carbon so we are going to begin with the fuel system, even if it looks difficult to do. Usually people take one look at the fuel tests and immediately start trying to avoid doing all of them by latching on to anything else they come across. Just know there is a lot of unsubstantiated misinformation out there.
Do the fuel system tests and report. We're not going to play the typical guessing games based on a someone said replacing this part fixed his. Diagnosis needs to be logical and complete - otherwise I'm out and don't intend to waste my time trying to drag you back on track. Fair enough?
However, you have told me that the spark plug was black with carbon so we are going to begin with the fuel system, even if it looks difficult to do. Usually people take one look at the fuel tests and immediately start trying to avoid doing all of them by latching on to anything else they come across. Just know there is a lot of unsubstantiated misinformation out there.
Do the fuel system tests and report. We're not going to play the typical guessing games based on a someone said replacing this part fixed his. Diagnosis needs to be logical and complete - otherwise I'm out and don't intend to waste my time trying to drag you back on track. Fair enough?
#12
It could be that your remaining problem might be the CMP retard setting and/or distributor gear wear aggravated by a less than optimal distributor cap. New distributor cap could potentially temporarily cover up a problem, only to have it come back in a little while (or the new cap could truly be the cause - IMHO doubtful) - but it's all pure speculation without solid testing.
However, you have told me that the spark plug was black with carbon so we are going to begin with the fuel system, even if it looks difficult to do. Usually people take one look at the fuel tests and immediately start trying to avoid doing all of them by latching on to anything else they come across. Just know there is a lot of unsubstantiated misinformation out there.
Do the fuel system tests and report. We're not going to play the typical guessing games based on a someone said replacing this part fixed his. Diagnosis needs to be logical and complete - otherwise I'm out and don't intend to waste my time trying to drag you back on track. Fair enough?
However, you have told me that the spark plug was black with carbon so we are going to begin with the fuel system, even if it looks difficult to do. Usually people take one look at the fuel tests and immediately start trying to avoid doing all of them by latching on to anything else they come across. Just know there is a lot of unsubstantiated misinformation out there.
Do the fuel system tests and report. We're not going to play the typical guessing games based on a someone said replacing this part fixed his. Diagnosis needs to be logical and complete - otherwise I'm out and don't intend to waste my time trying to drag you back on track. Fair enough?
#13
From my first post in your thread...... "Also suspect is the ignition system (because of your comments about cap fixing some misfires) , but in your case I believe you should start with the fuel system and competely verify its operation before moving on. Note no parts replacement required to do this verification! Just work!"
You are not comprehending my strategy, are not listening, and clearly don't want to do as I am advising.
I'm out. Someone else want to help Loganu01? There are certainly other qualified people here that can.
Last edited by LesMyer; 10-30-2015 at 12:36 PM.
#14
Sigh..... You was also told your PCM was the problem.
From my first post in your thread...... "Also suspect is the ignition system (because of your comments about cap fixing some misfires) , but in your case I believe you should start with the fuel system and competely verify its operation before moving on. Note no parts replacement required to do this verification! Just work!"
You are not comprehending my strategy, are not listening, and clearly don't want to do as I am advising.
I'm out. Someone else want to help Loganu01? There are certainly other qualified people here that can.
From my first post in your thread...... "Also suspect is the ignition system (because of your comments about cap fixing some misfires) , but in your case I believe you should start with the fuel system and competely verify its operation before moving on. Note no parts replacement required to do this verification! Just work!"
You are not comprehending my strategy, are not listening, and clearly don't want to do as I am advising.
I'm out. Someone else want to help Loganu01? There are certainly other qualified people here that can.
#15
Looking for the following 4 numbers:
1) Pressure reading at service port with engine off and pump energized
2) Leakdown test - entire system
3) Max fuel pump output pressure
4) Pump-only leakdown test (after max output pressure)
I'll be here when you get the tests done and post the results.
Last edited by LesMyer; 10-30-2015 at 01:50 PM.
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