LSCha0s

iTrader: (4)

I have a 91 Corvette... the specs.

built/forged 5.3 347 iron block with 241 heads

MS3 cam
237/242, .603"/.609", 113 LSA

LS6 Intake

Wiring harness and PCM from a 99 Z28 tuned for the set up.

Some times It will not go WOT. I have tightened the cable and it seem to have made it worse. I drove it to work this morning and after I got on the highway I floored it several times in a 10 mile run and it never went WOT.

What am I looking for TPS..Tune? Please give me some direction.

Thanks

gofastwclass

iTrader: (2)

I'm confused, please define "Some times It will not go WOT." That could mean at least three things to me:

1. The engine feels flat and / or doesn't rev when you floor it.
2. When you data log the engine the throttle percent is less than 100 on drive by cable and 88 for drive by wire.
3. It isn't meeting the criteria for WOT in the tune.

Those three different things could have three different directions for troubleshooting and solutions.

LSCha0s

iTrader: (4)

#1
I don't have anything to data log with. It's also intermittent I can floor it and nothing happens and then try again and it works. Is also a cable driven TB. Sorry for the confusion.

LSCha0s

iTrader: (4)

You gave me an idea. I dont have anything to dtalog with but I do have a Preadtor for my GTO.

I plugged it in and monitoring my TP angle I slowly worked it to %100 then I jiggled the connector and wirring to test for a bad connection.

So far it looks good. I also took it for a ride and went WOT while watching the TP angle. It worked but I was not able to duplicate the problem so I cant say what the TP angle is when it happens.

The plan now is to leave it plugged in for the next time it happens.

85MikeTPI

iTrader: (9)

The TPS is the only input to the PCM that tells it where the throttle is and when to got WOT. If the wiring and grounds are ok, and the blade connection to the TPS is solid, then the TPS itself is probably giving false readings to the PCM..

LSCha0s

iTrader: (4)

That is what I was thinking thanks Mike.

LSCha0s

iTrader: (4)

I tried a new TPS and it makes no difference. I'm starting to thing it's a tune issue. I have had it tuned 3 times now. I think its time I learned how.

It feels like it maybe bogging at WOT(too much fuel). If you slowly depress the pedal or drive around normally it is not noticeable at all.