Driveline Failure.......but which part?
05-15-10, 04:10 PM
#1
Driveline Failure.......but which part?
1987 TII
Stock Turbo, and ECU , 3" exhaust
So I was on the interstate last night and I was gradually loosing speed.
At first I could only go 80 mph, then 70 and so on and so forth over the next 20 miles until I was governed to 40mph. Finally as I started up a large hill I could tell I wasn't gonna make it to the top, and pulled over
Blipping the throttle was helpful to maintain speed for a while, but eventually that stopped working. Near the end I started shifting gears to see if that would help, at first it helped for a few seconds each time, but as I started going up the hill that didn't work either
Ever since I replaced the OMP lines it seems that something is lacking on the top end, my thought was a messed up connection to the secondary injectors. The bogging first started around 3500 rpm so I figured it was just the primaries running out of capacity, but over the past week, that point as gradually fallen.
The clutch was replaced about 1.5 yrs ago (by a shop), but it's always whined w/ the clutch pedal depressed at stop signs and the like.
The diff was recently rebuilt with new seals, about a month ago.
The car idles fine, and revs fine in neutral. Before the interstate trip it would drive just fine unless:
A) RPMs exceeded 3400
B) You got into boost
ANY IDEAS?
Stock Turbo, and ECU , 3" exhaust
So I was on the interstate last night and I was gradually loosing speed.
At first I could only go 80 mph, then 70 and so on and so forth over the next 20 miles until I was governed to 40mph. Finally as I started up a large hill I could tell I wasn't gonna make it to the top, and pulled over
Blipping the throttle was helpful to maintain speed for a while, but eventually that stopped working. Near the end I started shifting gears to see if that would help, at first it helped for a few seconds each time, but as I started going up the hill that didn't work either
Ever since I replaced the OMP lines it seems that something is lacking on the top end, my thought was a messed up connection to the secondary injectors. The bogging first started around 3500 rpm so I figured it was just the primaries running out of capacity, but over the past week, that point as gradually fallen.
The clutch was replaced about 1.5 yrs ago (by a shop), but it's always whined w/ the clutch pedal depressed at stop signs and the like.
The diff was recently rebuilt with new seals, about a month ago.
The car idles fine, and revs fine in neutral. Before the interstate trip it would drive just fine unless:
A) RPMs exceeded 3400
B) You got into boost
ANY IDEAS?
05-15-10, 05:05 PM
#3
Drivetrain is relatively simple. Either it works or it doesn't.
Does that car move easily in neutral or is in binding? Does it move in first gear? How far up in RPM and speed in first can you get? How about the rest of the gears?
The whining from the clutch depressed means a bad throwout most likely. It seems like the issue could be engine related. Post more information.
Does that car move easily in neutral or is in binding? Does it move in first gear? How far up in RPM and speed in first can you get? How about the rest of the gears?
The whining from the clutch depressed means a bad throwout most likely. It seems like the issue could be engine related. Post more information.
05-15-10, 07:37 PM
#4
A local trans/diff shop rebuilt the diff.
Car rolled off the two truck just fine in neutral. It will move in first gear, I've only moved it about 5 feet since it got back to the house though so I'm not sure how fast or how many RPM it'll go to now.
Before I could go to 30 or so in first, RPM would go to redline if kept @ low boost. The higher the gear, the lower the RPM "limit" it wasn't really noticeable until 3rd though.
Engine related ehh? hmmm. At first I suspect a clogged fuel filter but the way it kept getting worse, and the rate at which it did so made me doubt that.
I've been running premix as insurance w/ the new OMP, so I also suspected fouled plugs, but its running no where near rich....narrowband was showing 20+ afr while cruising but I've been tracking an intermittent interior electrical gremlin that will sometimes make my boost gauge reset while driving so I'm not sure how much stock to put in that...
Car rolled off the two truck just fine in neutral. It will move in first gear, I've only moved it about 5 feet since it got back to the house though so I'm not sure how fast or how many RPM it'll go to now.
Before I could go to 30 or so in first, RPM would go to redline if kept @ low boost. The higher the gear, the lower the RPM "limit" it wasn't really noticeable until 3rd though.
Engine related ehh? hmmm. At first I suspect a clogged fuel filter but the way it kept getting worse, and the rate at which it did so made me doubt that.
I've been running premix as insurance w/ the new OMP, so I also suspected fouled plugs, but its running no where near rich....narrowband was showing 20+ afr while cruising
but I've been tracking an intermittent interior electrical gremlin that will sometimes make my boost gauge reset while driving so I'm not sure how much stock to put in that...
05-15-10, 08:25 PM
#6
20+ AFR.... That is interesting and probably why your car is not producing power. The fact that it gets worse in higher gears could be due to the added load on the engine and your poor AFR's.
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05-15-10, 11:27 PM
#9
Well, as soon as I cracked my omp lines (replacing those bastard LIM coolant O-rings) I started running premix. Even though I've replaced the pump I'm still running 150:1 just to be safe. If there's one thing its NOT gonna do its seize.
Good points about the drive train. I realized after I posted that it might not be the clutch, because the RPM's would still increase even if it were slipping
So I guess now the question is, what is causing these AFR's? As previously stated, even under load, at lower RPM its (was at least...) fine, its only under increased load; either via boost or higher RPM that this problem arises
Would a fuel filter get THAT much worse over such a relative short period? I guess its time for a fuel system check...?
Good points about the drive train. I realized after I posted that it might not be the clutch, because the RPM's would still increase even if it were slipping
So I guess now the question is, what is causing these AFR's? As previously stated, even under load, at lower RPM its (was at least...) fine, its only under increased load; either via boost or higher RPM that this problem arises
Would a fuel filter get THAT much worse over such a relative short period? I guess its time for a fuel system check...?
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