joshwiles

I'd sell it for like $50. Im almost positive It's had some porting work done on it. It appears that the person who did it starts to make the runners larger but then decided he didn't want to go all the way up the runner. It's hard to explain, I can take pics if you want. I'm not sure what stock crossfire engines flow, but mine would shift at 5200 RPMs, where I think most shift at 43-47ish. But I believe I have 1.6 RRs as well. I need to pull the valve covers and check, just too lazy. My car had some work done when I got it and I've been tracing what's been done.

danvetman

No, I thought maybe if you were just dumping it, I would take it. I'm sure its worth $50.00 though. I will just port the one I have on the car. Thanks anyway.

joshwiles

I am proud to announce that I am the owner of a throttle body injected vette. I got the throttle body in tonite and fired her up. She ran terrible until I realized that I had misread my own writing on the spark wires and switched 3 and 8 around. As for the IAC problem, I don't have it. Works fine like it is. I do have an SES light, but I think it's from the backwards plug wires, haven't checked the code yet. All I have left is: fix coolant leak around thermostat housing, get a bigger hood scoop to cover the big gaping hole in my hood with an air cleaner coming out or get a carb hat, swap to crossfire injectors (maybe, might just use the ones i got), and time the beast. Thanks to all and your support

ex-x-fire

I think there is a difference between the front & rear injectors on the cfi. Stock 5.7l tbi injectors are rated at 62lbs, cop cars are rated at 68psi.

jseremba

I have a stock 1984 Corvette with 4 spd manual with 71K miles on it. The car is stock. all I want it to do is idle smoothly and restart when it is warm.
I tried to syncronize the TBI's using a manometer. Idle went to 1300 to 1600 rpm.
The TPS is adjusted correctly i.e. 0.46 volts at idle and 4.7 volts at full throttle.
Would replacing the fuel pressure regulators help my idle. they are the originals.
Oh and the timing is stock 6 or 8 BTC.
I need to use starter fluid to restart the warm car.
When I crank the engine fuel DRIPPLES out of the injectors. One spray of start fluid and she is running fine.

Thank you all

jseremba

Your TBI vette. cFI or single TBI

ninetyone1

I burn custom chips and if you want to see a NOTICEABLE difference let me know. I can burn you a new performance prom.

jseremba

Frankly if a custom ship would get it to start without starter fluid and idle smoothly I would buy it. Presently my interest in the car is enjoying it up to about 100 mph and drivng it through some scenic areas with a few curves and hills thrown in for fun.

ex-x-fire

Make sure the egr valve isn't stuck open or getting vacuum at idle.

jseremba

I will take a look at that thank you

ex-x-fire

Looks like the tps voltage should be 0.545v at idle.
Your injectors might be dirty & leaking. These tbi systems don't hold pressure like the tpi engines do.

jseremba

They do not leak. they just do not feed fuel and then when I use start fkuid they run

coupeguy2001

If you pick up a set of 1990-1992 Camaro or firebird heads, the center bolts are angled just the way the manifold holes were. Usually, people give those away, or close to it..
they come with 64cc, and would give your engine a compression boost.

Tom400CFI

What do F-body heads have to do with anything in this thread? "vette heads have the same bolt angle, BTW, up to '91.

Your fuel pump is not charging the fuel system. Check your Fuel pump relay.

jseremba

So if I disconnect my fuel line and start the car. I should get a surge of gasoline, correct.
Now If I am getting the surge. Then the injectors are not pulsing, I think.
What tells the injectors it is time to pulse.
Thank you this is a big help.

Tom400CFI

If you disconnect your fuel line, turn the key to "run", the fuel pump should run and fuel should flow abundantly from the fuel line, for about 2 seconds.

A better way to check is to install a "T" in the rubber fuel line between the frame rail and engine, and install a fuel pressure gauge. When the pump cycles for that 2 seconds when you turn the key on, you should see 9-13 PSI on you fuel gauge. If not find out why.
Pump not running? (likely, based on your posts)

corvettenorway

change the o rings on the injectors !!!!!

corvettenorway

read this !!! http://www.thecubestudio.com/Crossfi...yBalancing.htm

jseremba

I did change the O ring on the injectors already. but the T in the line is a great idea.
I will be testing the Temperature Coolant sensor Wednesday, I hope.
One thin about the TCS. My digital readout in the car is accurate. I know this because I put a 205 degree fan switch in the car and at 205 degrees the fan turns on.
So can the TCS be bad and still give me accurate temperatures on the dash.
Should I be upgrading to a 7747 ECM even if I keep the stock CFI system?

thank you

jseremba

I did this on Sunday and my idle went to 1500 rpm warm I ended up turning the rear TBI screww down to reduce the idle to 1000 rpm.

What I did not understand is I set the idle speed so that the manometere read 6 inches. Then did the front TBI unit and ultimately end up using the rear TBI unit to reduce the idle speed. Doesn't that mess everything up?
I used the WinAldl software. Interestingly enough it actually smoothed out the car, when connected. Does that mean anything?