1996firebirdformula

iTrader: (3)

Well i went to Town then came back. hour later i had to go back to town. I started my car it showed 160 dregrees on the temp. I was pulling out of driveway on kind of a slope and i let out on the brake alittle and it started like bucking. And once it gets 215+ it starts having rough idle.

What could be the problem it runs perfect when its at like 180 Degrees.

Purple95Z28

iTrader: (6)

215+ degrees? How hot is it getting?

1996firebirdformula

iTrader: (3)

It gets up to 230 in Town then fans kick on bring it back to like 220 It was hot yesterday like 90 outside.. I had A/C on whole time i had make few trips around town.

I replaced Stock Thermostat. New plugs & fuel pump last year.

Formula350

iTrader: (3)

Which is all perfectly normal operating temps for an LT1. I'd say that either you're running too low octane of fuel and it's just having problems igniting, or similar situation but your plugs/wires are kind of old and aren't being able to ignite all the fuel.

1996firebirdformula

iTrader: (3)

I run 94 octane.

Could be 02s? its got 118k miles


Shobox Says

Something else to consider, is that when the engine gets to ~220º (even before the stock fan ON temp of~226º) and you are at MAP loads of 70Kpa or more, the PCM begins to retard the timing. That is one reason why people feel their cars don't run well when they are hot. The GM folks built the retard into the spark tables because when the engine is hotter, there is more chance for spark knock. If you can keep the temperatures from getting up into that range, then you might feel more power when you need it.