Crank sensor..

[Chuck Leeper]

Is it common for the crank sensor to cause an engine start up go to backfire thru the intake??
Still having backfire issues.
Cam sensor set, backfire. Reset the sensor 180*, same results.
Had ft cover off, found cam advanced, corrected it. Same issue.
New coil/mod, wires, plugs, injs, chip, inj harness, valve springs, etc, etc.
Grounds verified, fuel psi set, tps set, yadda, yadda.
This is getting old! even OLDER than I am....

 

[Chris McDade]

Chuck I wouldn't think so. Do you have a spare to try? Did you check cam sensor cap?


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[Chuck Leeper]

Chuck I wouldn't think so. Do you have a spare to try? Did you check cam sensor cap?


Posted from the TurboBuick.Com mobile app

Chris, the engine ran before I took it out for a cleaning/reseal job. {Not well, due to nasty w/g, intake hose ripped, bad coil/module, etc.}
I haven't checked the cap, persay. It looks new in and out, wires/plugs are clean, no bent pins, drive tang good, rotor tite, etc.
It sets when I use the cam set box.
I re-checked the crank sensor gap.. Good @ .025".

I'm out of ideas, except the chip may have taken a "core dump" Not sure that would cause this, either. I did pull it, check it for pins out of whack, nada.

Don't know what else to "re-check", other than pull the ft cover....
I have a new gasket set on hand, for just such an "event"...

Thanks for the help...

 

[dynoman]

You didn't cross any plug wires ??

 

[Chuck Leeper]

You didn't cross any plug wires ??

Nope. I've checked that at least 5 times...Still looking.

 

[whitehot1]

Could anything like this have happened ? Or the wiring to the coil pack from the module got crossed.

http://www.installationinstructions.com/FYI/ccci-failure.pdf

 

[TurboTdr3.8]

What about the wiring of the coil to module , all wires in the right order ?

 

[Chuck Leeper]

Took the t cover off,....again. Cam is in correctly.
It's by me...

Could anything like this have happened ?
http://www.installationinstructions.com/FYI/ccci-failure.pdf

The engine fires, but then back fires. Can't say that it will/won't run and then die. It's never run since the new "stuff was put on.

 

[Chuck Leeper]

What about the wiring of the coil to module , all wires in the right order ?

It's off the car, now. Am going to check that next. I hope not, as that stupid mistake, and chasing it everywhere else, will REALLY piss me off!!

 

[Chuck Leeper]

Pulled the coil off the module, looked for the wiring in the shop manual..No luck.
The 4/2/6 tabs have the 3 blu wires on them.
The 1 has green, the 5 has yello, the 3 has another single blu wire on it.
I did a search, to locate the wire swap test, and came up empty. As usual, I misplaced what I had written when I tested the old coil/module w/ the casper tester...
NE 1 remember what the yelo, green, single blu is supposed to go to? [I think the single blu should have a stripe?}
I may have it fubar'd.. Everything else I've done is.
Crossing the green and yelo would cause a misfire, right?? IF so, I'm going to hit myself in the ballz! My head is too empty to hurt!

 

[TurboTdr3.8]

Try this on the colors

 

[TurboTdr3.8]

Crossing the green and yelo would cause a misfire, right??

yes

 

[Chuck Leeper]

yes

Try this on the colors

DAMN!! If that pic is labelled correctly, I have 1 and 5 crossed! NO WONDER it backfires!!
Firing a cyl on an open intake is a sure "fire" way to make a mess!
All this work, ft cover off twice, cam sensor in and out til it's worn thin. All because I didn't dbl check EVERYTHING I had changed..
A lesson for you new guys, working on these antiques!

Thanks everyone, for the suggestions, and for the help!
Now, all I lack, is finishing up!.. This is embarrassing.. Too may yrs away, and working on the LS stuff. That, and being older than dirt, doesn't help!

 

[dynoman]

↑
You didn't cross any plug wires ??
Nope. I've checked that at least 5 times...Still looking.

Looks like it was a bit farther upstream ! Glad you found it . Sam

 

[Chuck Leeper]

↑
You didn't cross any plug wires ??
Nope. I've checked that at least 5 times...Still looking.

Looks like it was a bit farther upstream ! Glad you found it . Sam

 

[Nasty Wendy]

Chuck you messed up by not crossing the plug wires. Crossing the plug wires would have created a double negative.....and fixed the problem.

 

[Chuck Leeper]

Chuck you messed up by not crossing the plug wires. Crossing the plug wires would have created a double negative.....and fixed the problem.

I never thot of that!! Of course, I never thot of crossed wires, either!
Bout ready to turn the key....
I'm wondering, if I crossed ALL the wires, would the engine run backwards??

 

[Chuck Leeper]

A follow up:
Put the car back together, changed the coil wires around, hit the key. WALA! It runs. Ran for a few secs, and shut it down to look for leaks, etc.
Installed the new S&B air cleaner. That's 1 NICE piece! $39, plus the ride. Quality is far and away better than the others...... Nice folks to talk to.
Now, on to adjusting the Pypes system, adding a couple hangers. Then, IT'S HAMMER TIME!
The rear tires have entirely too much tread on them.

Thanks all, for the help

 

[Nasty Wendy]

I never thot of that!! Of course, I never thot of crossed wires, either!
Bout ready to turn the key....
I'm wondering, if I crossed ALL the wires, would the engine run backwards??

That must be how they got this scene to work!!

 

[TurboTdr3.8]

A follow up:
Put the car back together, changed the coil wires around, hit the key. WALA! It runs. Ran for a few secs, and shut it down to look for leaks, etc.
Installed the new S&B air cleaner. That's 1 NICE piece! $39, plus the ride. Quality is far and away better than the others...... Nice folks to talk to.
Now, on to adjusting the Pypes system, adding a couple hangers. Then, IT'S HAMMER TIME!
The rear tires have entirely too much tread on them.

Thanks all, for the help

Glad to hear you are running and not pooting and popping , glad to help out cause I was fixing to make 3hr road trip to come and help you to get it going . Maybe next time Grin !!!!!