SMAN's Dyno Disater - Updated - Electrical Issues

[meissen]

Hrmm.... I'm about 99% positive I used my v6 trans brace. v6 to v8 are both 4L60e's, body/floorboards are identical... I can't see what the difference would be? Although I vaguely do remember having to elongate a hole somewhere maybe it was on the trans brace.

[sman]

So did I, might want to look into changing that out.......

Theres a HUGE difference in stiffness between the two. Between the steel driveshaft, v6 trans mount, and the tail mounted tq arm, I guess im supprised it didnt break sooner....


Edit: B, did you edit your last post? Either that or I was super tired, cause the first sentence in mine no longer makes sense, lol.

[sman]

You were able too just elongate the the hole that the bolt for the trans mount uses? I don't think that's possible on mine. Maybe that's a difference between LS and LT cars?

[meissen]

I'm trying to remember exactly... I think the LT and LS are different. If I remember my trans mount correctly, there's one bolt that goes through the actual poly mount right in the middle into the transmission and then there's two bolt holes (one on each side of the poly mount) that the trans mount bolts use. I think I elongated the two holes.

PS - Yeah I added the part about elongating the holes in that last post

[sman]

Got a trans x memeber, and I literally JUST got home from picking it up, I left at 730am. What a day, all for some stupid ass piece of metal..... correction, WAY overpriced stupid ass piece of metal....

So tired from the drive im not even going to work on it, hopfully this fixes my problem. Updates later.

[1BADAIR]

http://www.yellowbullet.com/forum/sh...&postcount=407

[sman]

Got it all together, went to back to the bricks last night, drove to work today, picked up a friend and was headed back to the bricks, when the SES light came on, and car died, started pack up but had to relearn idle, was generally running like shit, no power. Happened to have my bluetooth OBD dongle with me so I scanned it with my phone and pulled up P0355. Which says ignition coil failure cyl 5. Pulled the plugs and out of all 8, cyl5 seems the nicest, figures. Wires werent new when i put them on last year, so thats the next step, but im affriad its probably the coil. Gonna swap 2 of them and see if it continues.

Do you ever replace just one coil? Shouldnt they all be replaced at once?

Bummer is I had reserved front row parking on the bricks in the sponsors area tomorrow, and now im not going to make it. What a couple of weeks, full of fail lately........

[Derek]

I had a few coils go bad on my old v6, about 6 months apart. We just replaced 1 at a time... no problem, and they weren't that expensive.

[sman]

There 50 a piece at auto zone probably more at the dealer. Just wasn't sure if the new coil would create more spark than the old ones, and if that hurt anything our messed with the tune?

[1BADAIR]

which ones do you have?

[sman]

Pulled the plugs, I just assumed that code meant no spark, and they were terrible, looked like they had 100k on them, just covered in oil and build up. (i have valve seals, just wasn't the car to run first) Replaced plugs and wires, cleared code, it immediately returns, and runs bad, I'm assuming on 7 cylinders?

Swapped coils for the one next to it, cleared code immediately returned, again for cyl 5, code should have moved to cyl 3 if it was a bad coil.

Swapped coil pack assemblies from driver to pass side of motor too rule out coil pack harness.

Hooked a spark tester on cyl 5, only an occasional dim blip on the tester, however this was so far and few between, like once every 15 or 20 revolutions is the motor, hooked it up to another cyl, it lit up like a christmas tree, so we clearly have a spark problem.

Checked for continuity and resistance between pin 68 on the red pcm connector and the green coil trigger wire for cyl 5, had continuity, and resistance was exactly the same as the wire for cyl 3.

Just checked power and ground to that coil, was good.

No idea what to do now, nothing makes sense.

[sman]

Larry, I have the round truck could with the heat sinks.

[1BADAIR]

you can have continuity and resistance tests that are normal even if all but 1 strand of wire is broke. this will not carry the current.

the PCM has a driver for each cylinder. the pcm may be bad

[sman]

So what's the next step?

[sman]

To check for sufficient current I soldered some wire to a old headlight bulb, and was able to run it off of the coil power and ground wires, so we should be good there.