I’ve seen them put in upside down before. That guy was a Chicago Firefighter. I’m guessing he was good at that.
Misfire madness
- Thread starter Frank4
- Start date
Stew, I am about to go out and let it run for as long as I can and get codes. I can pull live data, what sets would be helpful for you to see? I am using and AUTEL619 and think I can see almost anything.
Fuel trim is at the top of the list, correct? What else?
Outside compression leak on #6. Same exact spot that it blew 70k miles ago. Oil looks good and no outside compression leaks
I think you crossed a plug wire. Theres really not much chance of you fixing this thing. I think you should show it to a friend who maybe can help you.
Haha, You are messing with me right? This happened while I was driving it. It was running as good as to ever has and the starts missing. Crossed plug wires aren’t the problem. I really hope you are joking.
Well your all over the place with what the truck is actually doing. I said you crossed a plug wire and nope cant be, I ask if its a trailing misfire and you say yes thats what it is but it runs like shit all the time. It's like a computer, crap in, crap out.
Hey man, the only thing I was confused about was the trialing misfire definition. I wasn’t familiar with it but you said it happens on deceleration and that’s when the breakdown happened, in deceleration. My bad, I wasn’t familiar with the term and should have asked more questions. Everything else I have described is consistent. The reason I said it can’t be a crossed wire is because it was running like a bat out of hell before the misfires. If the wires were crossed it would have never run. If you look back at my first post on this thread that is clearly described. That’s why I thought you were messing with me, honest I really did. When I asked if you were joking it was an honest question, I thought you were messing with me because I had said it had been running well. It wasn’t intended as condescending or flippant remark.
I really want to get back on track and find a solution. I am about to pull codes again as you suggested and really would like to know what live data would be helpful for you to see. You mentioned fuel trim, I know my Autel will display that. Can you suggest other data sets that would helpful. I will screen shot and post.
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Ok you say you put the heads on and you drove it a very short distance before it started to run this way. So you did the headgasket and it ran better than ever for about 15 min. Then it runs like this. Is that accurate?
Then you say the o2 sensors are doing what they are supposed to do. But do you know what they are supposed to do?
I think your trolling me. You can’t really be this dumb.
I think your trolling me. You can’t really be this dumb.
I’ve tried everything I know to do so I’ll take this abuse. I’ve checked live data on 02’s before and have seen the voltage go up and down and knew they were good. I have also seen zero volts in an 02 with no movement and knew it was a bad 02. That’s what I meant when I said I had checked the 02 voltage and it was good.
I am really bummed that I have given you the wrong impression. I recognized your handle and remembered that you helped on another issue years ago. I was excited to see that you had responded.
It threw an 02 and MAF code after the HG were completed. It ran fine with the codes but I swapped in a new 02 and MAD and it was better than I can ever remember. Did a short highway test drive, parked it maybe 4 miles. The next weekend I drive it to a friends house and that when the misfires on #3 and #7 happened, maybe another 4 miles.
Can you suggest any live data that will help me figure this out.
Thanks
If you know it’s 3 and 7 you might already have all the info your going to get from a scanner. Now you need to find out why those 2 cylinders are dropping out. Because it happened so soon after your headgasket job you can’t rule out a mechanical problem without a compression test. If you have spark at the end of the wire then look at the sparkplug. See if it’s wet with fuel, cracked, electrode not gapped right.
Keep it simple. You need 3 things to pop that cylinder. Fuel/spark/compression. Find the one your missing.
Keep it simple. You need 3 things to pop that cylinder. Fuel/spark/compression. Find the one your missing.
Ok. So now you know it’s engine mechanical. It won’t surprise me if that exhaust valve is stuck open. These valve guides need to be reamed larger I think it’s 7 microns. I could be wrong and the tool # ends with a 7.
If that valve is hung open and you payed for a valve job I think that guy owes you a set of headbolts and a pair of gaskets. I personally wouldn’t want to reuse the gaskets, but technically I think you could get away with it
But first. Tell me about your process for torquing the headbolts.
If that valve is hung open and you payed for a valve job I think that guy owes you a set of headbolts and a pair of gaskets. I personally wouldn’t want to reuse the gaskets, but technically I think you could get away with it
But first. Tell me about your process for torquing the headbolts.
I followed the RAVE specs when torquing the heads. I suspect the valve as well.
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