I recently laid my 1st gen to rest, and got a fantastic deal on a 3rd gen 1987 Chevy Camaro 5.0L w/ 4bbl. Everything original, in fantastic shape. The person I bought it from was a collector and not a mechanic. Though the engine was fine, the electronics all needed replaced (all factory!) except the PROM. Without hesitation I replaced all of the sensors, and the car runs really good. But infrequently, and without cause the car will diesel, or sometimes pop out its exhaust seconds after the car is shut down. It never overheats, and seems to have a "dead spot" in the pedal about 1/4 to 1/2 the way down. No codes are shown (since all the new electronics) and the mechanical seems to be in perfect order. Anybody have a clue why its so touchy?

 

Orion,

Welcome aboard!

The dieseling is often a cause of a rich mixture, overheated chambers, or excessive carbon in the chambers. The same could be true for the afterfire you are hearing after shutting off the engine.

The hesitation could be related, or from any number of other possibilities.

What is the spark plug condition? Is the mixture control solenoid adjusted correctly? How is the TPS voltage?

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Later,
Vader
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"No matter how hard you try you can't stop us now..."
Adobe Acrobat Reader 4.0

 

Thanks, been searching for a 3rd gen site for a long while now, and I am thrilled to have found one. The plugs are new, mixture control solenoid seems to be working like a charm, and the TPS voltage is perfect. As far as carbon build-up (which I will defin. look into - thanks for the hint, had somehow slipped my mind) couldnt I use (Dont remember the name off hand) BG 44?

 

Orion,

You could use that, or GM Top Engine Cleaner, or H2O (water). I've water injected a few engines clean with some success. A good hot engine at high idle with a heavy dose of injected water can clean itself fairly well. Do a little research in the board archives before you try this, but it can work. If you're not comfortable with that, the other cleaners can work, but take some time to do a thorough job.

Congratulations on your "find" - both of them.

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Later,
Vader
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"No matter how hard you try you can't stop us now..."
Adobe Acrobat Reader 4.0

 

Here is proof that water works quite well (Too bad I never intended this test to happen)



Just felt like posting that


Oh and I'd guess you've done it, but make sure the timing is right. Check the balancer to make sure it hasn't slipped too.

[This message has been edited by madmax (edited February 10, 2001).]

 

Vader, Madmax,

Thanks for all of the input, and so quickly at that! I will probably go with the cleaners first, and if they help a little then weve got the answer there. But, if they dont completely fix the problem the H20 would be a next move for sure. Boy, the whole water thing looks as though it could be quite the job in and of itself, and I will read up on it. That picture, I'm not a mechanic god, know enough to get by, but...

As far as timing, yep looked into it, perfect, balancer, no prob (but it never hurts to check thrice!).

As far as ny "finds" go, thanks.

If you saw this car (body, paint, interior, engine, its just so clean I couldnt believe it when I saw it - Its even got factory T's, and can really kick mean - think its too loud for the neighbors (great muffler and split exhaust shoving out the lopping roller cams growl, almost sounds like the 70 Firebird T/A) and got it for $1100!

As far as the website, its real quality with great info, and, like I said, its good to get quick responses from people who have their Camaros, Corvettes, and T/As in a row!

[This message has been edited by ORION (edited February 11, 2001).]

[This message has been edited by ORION (edited February 11, 2001).]

 

Max,

I recall discussing that photo before...

------------------
Later,
Vader
------------------
"No matter how hard you try you can't stop us now..."
Adobe Acrobat Reader 4.0

 

Thanks for the mixture comment on the dead spot, It would seem to be my Secondaries. I'll have to adjust my spring tension. Do any of you have any idea what the prime setting would be? I know to open it, then adjust until the Secondaries close,but would it be then 1/2 to 1 turns?