Z28madness

So my 1984 chevy corvette crossfire injection
Idles okay when you put it to drive it. When you start to step on it will feel okay if you step on it more the the cars power Won't kick on to a while or unless step on it more the power will start to kick in. People have told me it could be tps (throttle position sensor) or it can be my fuel injector. Not sure. The other thing is that sometime I start it up and drive it than when I step on it more let gas pedal go the car will stall out and be at low rpm. I would have to be slowly pushing the gas pedal it Won't stall out. If you guys know the problem is it would help a lot thanks.

scottajax

Hey, with my 84 any problems ive ever really had were fuel related. Get a new fuel filter on it, and check the fuel pressure. it should be around 13-14psi. Mine did something similar when I first got it. I changed to an 85 fuel pump and bought the pressure gauge line from DCS and it ran like a top

Z28madness

What's the difference between the 1985 fuel pump and the 1984 fuel pump.

Tom400CFI

The '84 pump is a low volume, low pressure, centrifugal pump.

The " '85 pump" (OR, any pump for a port EFI vehicle) is a fixed displacement pump capable of generating high pressure. The later style pump is better. If you diagnose low fuel pressure due to the pump, you don't have to get the "85 TPI pump", you can get any later model pump for a port FI application and the later pump you get, the better.

You can easily "T" into the rubber fuel hose that runs from the frame to the engine on the CFI car.

Z28madness

Thanks I'm gonna change my fuel filter and the pump this week

Tom400CFI

With out checking anything? O.K. You're money, but I'd test first. Let us know how it works out.

Z28madness

What do I have to check?

Tom400CFI

Fuel pressure. If your pressure is fine, and holds steady WOT, from idle to redline....why would you replace a pump?

Bill Curlee

The very first thing that I would check are the Diagnostic Trouble Codes.

See if any code is set.

Could be a

- Fuel Pressure issue
- Clogged CATs
- Damaged /clogged/ wet Air Filter

There are a LOT of thing to check before you start throwing parts at it.

Please let us know what it turns out to be.

Bill

Tom400CFI

I'd like to know how any of those things would throw a code.

I'd also like to know how the possible issue you suggested would have any effect on the OP's issue -other than the fuel pressure, which the ECM has no idea what the FP is.

The guy needs to START, w/a fuel pressure gauge here.

Bill Curlee

Why wouldnt reading DTCs be a place to start??????????? I never said that they would throw a DTC. There could be a DTC related to something else.


Could be something emissions or ECU related.. Right?????

Ever driven a Car with a clogged CAT?? Same symptoms.....

How about a frozen air filter.. Same symptoms.

I never said that the fuel pressure or fuel filter theory was wrong either. Could be...