My car feels like it hit a brick wall at 4500 rpms. Boost is threre, just seems the motor can give no more. This all started after I put in the RR cam. Ildes fine, 18" of vacuum, 42# fuel pressure (goes up with boost, even there when I hit the brick wall), It does this in all gears, so I assume its gotta be in the motor somewhere. Sometimes if I shift it hard between gears, after the bog, it takes about 30 sec. for it to clear up abit. Feels likes its loaded up or something. I've check everything besides changing the cam back out. Any thoughts?
If it's taking 30 seconds or so to recover, that sounds like it could be a lifter pumping up. I know you did some head work but I don't remember the particulars. How many miles on the springs and lifters?
Actually, I thought the same thing so the last couple days, I have taken the head off, and put new springs and HLA's in it. It's doing the same with the new stuff as with the old. I've checked everyhting I can think of.
[This message has been edited by Chad88TC (edited 06-16-2004).]
Collapsing VAM to Turbo hose?? Anyway to tell what the fuel mixture is doing??
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88 Silver T/C, original owner, 254,000 miles
Loaded except leather & auto trans
K&N, Gillis, SVO roller #1, big SS valves, ported intake, head, & exhaust
Polyurethane bushings throughout, Goodyear GT-HR 235/55R16's
VAm hose is fine, my a/f gauge is 1-2 dashes into the green. How can I tell if the valves are being held open? It runs very strong until it gets to 4500. Is it possible the RR is warn? The ranger I got it out of had 133,000 miles on it.
When I had the head off I went ahead and measured the "lash" at the heel of the cam. I shimmed the HLA's so that every follower had .042. I'm just wandering if the HLA is pumping up to allow the valve to open some.
If the cam was worn, you would see it.
I'm wondering if the HLA are pumping up and holding the valves open.
I had a similar problem with my 87 TC. It idled fine and drove fine under normal conditions. But, When I would kick it in the butt the engine would die out around 4500 rpm's. I would shift and it would start pulling again and die out at the same rpm's again. I had two problems The first was a restricted exhaust due to a baffle in one muffler had broke loose and the second was the coil was fried. Fixed both of those and the car ran great.
Is there a way I can tell if the HLA's are pumping up or not? I know its not an exhaust restriction. I "cleaned" the cat the other day and the muffler is fairly new. I got an extra coil, so maybe I'll try that.
I believe what I am experiencing is valve float. I have brand new valve springs. Could I have valve float on a ranger roller, with stock new valve springs?