Problem at the track!

[Heath]

I went to the track last weekend made three passes had a little knock on the topend every time so I would get out of it. Lack of octane, I left to much pump gas in the tank. 4th pass I was coming down the return road and my car started to run rough and then it died. Now when I crank it you can hear the engine pinging like you have spark plug wires crossed and it is really hard to crank. I found a vacuum line blown off I put it back on but the car still does not run any better, any ideas?

 

[1chance]

May have hurt something, when that vacum line comes off that effect fuel regulator, dont it? Look it over good, and a compression check.

 

[Heath]

I thought that but I wanted someone else to give me the bad news.

 

[QUIP'6']

I went to the track last weekend made three passes had a little knock on the topend every time so I would get out of it. Lack of octane, I left to much pump gas in the tank. 4th pass I was coming down the return road and my car started to run rough and then it died. Now when I crank it you can hear the engine pinging like you have spark plug wires crossed and it is really hard to crank. I found a vacuum line blown off I put it back on but the car still does not run any better, any ideas?

sounds like you may have dropped a valve

 

[Heath]

What causes that to happen?

 

[SouthernCal GN]

More info- what vac line popped off? When you crank the car, does is develop any oil pressure?

 

[Chuck Leeper]

Condition of the plugs?
Look at the rockers.
Broken valve spring?
Loss of a vac line will drop the boost signal to the FPR, regardless of where it came off.

 

[84BuickGNYorkPA]

Always sorry to hear this kind of bad news. Personally I would have a look at the drained oil and cut open the oil filter. Then pull the plugs and do a compression test... somewhere to start, also how old is the timing gear/chain?
Good Luck,
Chuck

 

[QUIP'6']

What causes that to happen?

just a severe speculation!!! probably popped a head gasket between cylinders and could be getting cross compression and intake between them and it also sounds like a timing chain issue. cant speculate till testing and teardown

 

[Heath]

The motor only has about 5-6000 miles on it. The timing chain is new. The vacuum lines next to the egr (that little box that attaches to the valve cover) I don't know what it is called.

 

[Heath]

I have plenty of oil pressure.

 

[QUIP'6']

The motor only has about 5-6000 miles on it. The timing chain is new. The vacuum lines next to the egr (that little box that attaches to the valve cover) I don't know what it is called.

egr solonoid

 

[QUIP'6']

I have plenty of oil pressure.

thats great but i would drain and see whats comes out and cut filter open and check paper. something is not right there.

 

[Heath]

ok thanks I will have to do it next weekend I am out of time.

 

[Lee Thompson]

Shot in the dark

Cam sensor !!!!!

 

[QUIP'6']

I have plenty of oil pressure.

how do you know if you cant start it

 

[Brer Rabbit]

Thats my guess...

Cam sensor !!!!!

There seems to be different symptoms when these go bad. Don't rule it out. Swap it with a known good one. Thats a 20 minute experiment.

 

[Heath]

I have a good cam sensor. When I get back to town I will swap it to see if that is the problem. The car will start it just runs really bad. I can hear it pinging sometimes at 1500 rpms. It will not idle at all.

 

[Heath]

I changed the cap on the cam sensor and no change. Do I need to change the stalk also? What about pushrods? What does it sound like when you bend one? What causes it? I am spinning my motor up to 6000 rpms. Any ideas?

 

[Chuck Leeper]

???

Condition of the plugs?
Look at the rockers.
Broken valve spring?
Loss of a vac line will drop the boost signal to the FPR, regardless of where it came off.

What did you find?
How about a comp test, a leakdown? Someone mentioned the oil filter. What did you find there?
Also, when you get it back together, ditch the 3.73's..3.42 will work just fine, and bring the engine r's down a bit ..