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Originally Posted by N0DIH My Cad (91 4.9 Dev) has an interesting, although scary problem.
When you are in neutral or park, doesn't matter, although more prevalent in Park, and you rev the engine, all of a sudden BANG! it sounds like you just revved into the parking pawl (that tone, like when you put it in park and let the car roll into the pawl). The engine torques up when that happens. It is taking a lot of power when it does it. The bang sounds like someone just hit the engine/trans with a 20 lb sledge hammer, HARD. It will scare the crap out of you.
It strikes me as coming from around the chain belt for the transaxle, but it is hard to tell. All it takes is rev it up to around 1000-1500 and it will do it randomly, only once, and I guarentee you will take your foot off the gas!!!
Is the chain slack and whipping or catching on itself? Is the parking pawl loose?
It never does it driving. Only while you parked or in N and revving it, when you are working on it.
No, I don't practice doing it, but obviously it isn't a good thing.
Thanks!
Tom |
Hmm, that is really funny, my 91 deville with 4.9L did same exact thing starting at around 170,000 miles. The thing is, mine was trying to shift into 1st gear while in park or neutral. I sold the car with 189,000, during the summer it wouldnt do it. Winter is the problem. I am 95% positive that it is a valve not closing and causing it to try to go into first. One time the car even moved ahead a little because of it.
To get the most out of the tranny, start the car and immediatly put in Drive. You could set the parking break first, but this is a problem because the car automatically releases the brake when started. Maybe you can change the parking break back to old style somehow.
Main thing is, your tranny is going to go. When?? Not sure. We drove ours for over a year like that.