Lacking power after head rebuild
#1
Lacking power after head rebuild
So I just went through the well documented spark plug issue. I will spare you the typical rant and get straight to the point.
The driver side head had to come off to get #s 7 & 8 out. I farmed this work out because I didn't have time and my knuckles were beat up enough just trying to get the stinkers out.
I got it back today and it just doesn't seem to have the same oomph. It feels like a 30+ hp loss. If this thing weren't computer controlled I'd say the ignition timing is retarded. Otherwise it is running smooth and no other problems to report. Is there any way to confirm this and have it reprogrammed if need be? I suppose I could be imagining things.
The mechanic says to drive it a few days and see if it improves- the computer may be going through some reprogramming on the fly. That doesn't sound right to me, but they're not equipped with any reprogramming tools anyhow; so I'd have to take it to the dealer for this I guess.
I don't doubt his skill as a mechanic and have no reason to think anything was assembled incorrectly. I guess I'm here to confirm that.
TIA, Bryan
The driver side head had to come off to get #s 7 & 8 out. I farmed this work out because I didn't have time and my knuckles were beat up enough just trying to get the stinkers out.
I got it back today and it just doesn't seem to have the same oomph. It feels like a 30+ hp loss. If this thing weren't computer controlled I'd say the ignition timing is retarded. Otherwise it is running smooth and no other problems to report. Is there any way to confirm this and have it reprogrammed if need be? I suppose I could be imagining things.
The mechanic says to drive it a few days and see if it improves- the computer may be going through some reprogramming on the fly. That doesn't sound right to me, but they're not equipped with any reprogramming tools anyhow; so I'd have to take it to the dealer for this I guess.
I don't doubt his skill as a mechanic and have no reason to think anything was assembled incorrectly. I guess I'm here to confirm that.
TIA, Bryan
#2
I'd give it a few days. It's not uncommon for the ECM to go through some stabilization after engine work. After a few days and it still feels the same, I would take it to the dealer and have them run a diagnostic on it.
#7
Cam phase, changing the valve timing. So, there are several things that could
have been screwed up on re-assembly.
#9
#10
oh well. i was hoping it was something i could do myself. all i have is a code reader. i doubt the mechanic i went to has this type of equipment, so i guess that means i'll have to go to the dealer.
thanks for your input. i have a feeling this is it. at partial throttle it feels "normal". if i step on it from a stop there is a flat spot around 2000 rpms, sort of feels normal (but not quite) until if shifts to 2nd. then it is a hard jump into 2nd.
if i step on it at highway speeds, there isn't much pull at all.
thanks for your input. i have a feeling this is it. at partial throttle it feels "normal". if i step on it from a stop there is a flat spot around 2000 rpms, sort of feels normal (but not quite) until if shifts to 2nd. then it is a hard jump into 2nd.
if i step on it at highway speeds, there isn't much pull at all.