Join Date: Mar 2002
Location: Austin, TX, USA
Re: 305 tpi won't Rev past 3500 once warm
It's been a few years since I've worked on a TPI ECM so take this for what it's worth. Some engine controllers (generally speaking) have a rev limiters. Often times the high rev is set to something like 7000 RPM. A few (perhaps many) have a rev limiter that engages at lower RPMs when the car is not in gear. If the TPI ECM has such a feature, perhaps the park / neutral signal is making the ECM think your not in gear and the rev limiter is holding you back.
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI