Rev limiter or what? Help!
Thread Starter
5th Gear
Joined: Nov 2008
Posts: 5
Likes: 0
From: Brooklet GA
Rev limiter or what? Help!
I have a stock 92 LT1 vette with the stock auto trans that has only 53000 miles and has been babied but when you accelerate quick and reach about 4500 rpms it stalls out right before shifting like the fuel has been cut off or the spark restricted. If you back off it is back to normal. I have been told this year did not have a rev limiter. I have placed in park and I do NOT get the stalling problem when reving. I have had the fuel filter changed with no change. I had it in the dealership for them to look at. They tried to tell me that the was an intake leak that was allowing oil down into the distributor. They wanted to replace the distributor and intake gasket. After refusing and returning home for futher investigation there was no such problem - a little dirty but no sign of oil. Any ideas of what is causing this?
Pro
Joined: Jan 2008
Posts: 584
Likes: 1
From: Near Lockport NY Black 1986 Coupe
It could a number of things, including the opti, plugs, wires, sensors, or the fuel pump itself. I would check the plugs first to see if they're fouled. If not, I would go after either the opti or fuel pump next. My money is that it's in the ignition somewhere.
Team Owner
Joined: Dec 1999
Posts: 34,873
Likes: 487
From: Lacey WA RVN 68-69
NCM Sinkhole Donor
The LT1 does have a rev limiter but it's a fuel cutoff. It comes in at just over 5800 RPM.
As above, I would be looking at plugs, wires or the Opti cap as your description indicates that the problem is under load. You should check fuel pressure too. An intake manifold leak into the ports is also a possibility.
As above, I would be looking at plugs, wires or the Opti cap as your description indicates that the problem is under load. You should check fuel pressure too. An intake manifold leak into the ports is also a possibility.
Intermediate
Joined: Sep 2008
Posts: 31
Likes: 2
From: Springdale Pa
check spak plug wires not touching
I had installed a new set of 8.5 mm wires on my 92 lt1. I would get a similar breaking up *intermittently* around 4,500 - 5,000 rpm when autocrossing.
I found my wires had "settled" out of position and were touching each other, some crossing, and worse, some laying parallel to each other. They were too thick for the factory looms.
I bought some aftermarket wire looms without the stand-offs, and installed them so they would not allow the wires to touch each other, and it seemed to have solved my problem. It now tachs up cleanly all the way to the limiter.
I found my wires had "settled" out of position and were touching each other, some crossing, and worse, some laying parallel to each other. They were too thick for the factory looms.
I bought some aftermarket wire looms without the stand-offs, and installed them so they would not allow the wires to touch each other, and it seemed to have solved my problem. It now tachs up cleanly all the way to the limiter.
