Performance Fuel Injection Systems
Thread Starter
Instructor
Joined: Sep 2013
Posts: 120
Likes: 1
From: Hattiesburg MS
Performance Fuel Injection Systems
1982 CE Corvette.
Rebuilt my Chevy SB 350. Removed the Crossfire system. nstalled a Performance Fuel Injection System.
Has anyone ever used this system/company before? Having a lot of problems!
Has anyone ever used this system/company before? Having a lot of problems!
Safety Car
Joined: Nov 2005
Posts: 3,532
Likes: 1,185
From: Arizona - If you don’t know CFI, STOP proliferating the myths around it...
Never heard of them before now. Why did you ditch the CFI system? Looks like you went back to TBI anyway. Just wondering.
Race Director
Joined: Apr 2007
Posts: 11,152
Likes: 890
From: South Western Ontario
At the prices for what you get I'm surprised they're still around.
The biggest issues I see are the fuel pump not having baffles in the tank, the 1-wire O2 sensor that won't work in headers and the custom PROM which is likely not properly tuned for the engine.
Still, it's basically just a stock TBI system which is fairly simple to work on. So, what issues are you having?
The biggest issues I see are the fuel pump not having baffles in the tank, the 1-wire O2 sensor that won't work in headers and the custom PROM which is likely not properly tuned for the engine.
Still, it's basically just a stock TBI system which is fairly simple to work on. So, what issues are you having?
Thread Starter
Instructor
Joined: Sep 2013
Posts: 120
Likes: 1
From: Hattiesburg MS
Plugs are sooted. Too much Fuel. #2 cylinder fouls out. It will crank one day and the next it will not. Timing is set at 8°. Have sent ECM, Distributor, O2 Sensor, and MAP sensor back to Pfisys. They rechipped and sent back. Reinstalled and adjusted. Car ran OK in the shop. Took it out in the road. Spit, sputtering, stall, die made it back to shop. Rechecked everything. Was instructed to check timing several different ways as per Pfisys tech. Set at 8°. Car would run but backfire though carb. Frustrated. Next day car would not start. Very frustrated with engine and fuel injection. Pulled valve cover on right side to check #2 cylinder valves.
You mentioned headers. I installed Howard Cam, heads are 64 cc cast iron, headers are 1 3/4" block hugger shorties.
You mentioned headers. I installed Howard Cam, heads are 64 cc cast iron, headers are 1 3/4" block hugger shorties.
Race Director
Joined: Apr 2007
Posts: 11,152
Likes: 890
From: South Western Ontario
How did you set the timing? Disconnect the ESC bypass wire first?
Have you checked the fuel pressure?
Ran the gauge during driving to ensure a constant fuel pressure?
Have you logged it to check that the sensor data appears correct and then to see how close the tune is?
Have you checked the fuel pressure?
Ran the gauge during driving to ensure a constant fuel pressure?
Have you logged it to check that the sensor data appears correct and then to see how close the tune is?
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Thread Starter
Instructor
Joined: Sep 2013
Posts: 120
Likes: 1
From: Hattiesburg MS
Rechecked distributor, reset #1 to TDC. Everything was good. Not 180° out. Still not running right. Will run ok in shop. Will not run right under load.
Thread Starter
Instructor
Joined: Sep 2013
Posts: 120
Likes: 1
From: Hattiesburg MS
How did you set the timing? Disconnect the ESC bypass wire first?
Have you checked the fuel pressure?
Ran the gauge during driving to ensure a constant fuel pressure?
Have you logged it to check that the sensor data appears correct and then to see how close the tune is?
Have you checked the fuel pressure?
Ran the gauge during driving to ensure a constant fuel pressure?
Have you logged it to check that the sensor data appears correct and then to see how close the tune is?
Not sure I understand your question on the log. I have kept info from the scanner to see what changes.
Thread Starter
Instructor
Joined: Sep 2013
Posts: 120
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From: Hattiesburg MS
It is suppose to have a self learn. Have managed to log 75 miles but nothing has gotten better.
Thread Starter
Instructor
Joined: Sep 2013
Posts: 120
Likes: 1
From: Hattiesburg MS
At the prices for what you get I'm surprised they're still around.
The biggest issues I see are the fuel pump not having baffles in the tank, the 1-wire O2 sensor that won't work in headers and the custom PROM which is likely not properly tuned for the engine.
Still, it's basically just a stock TBI system which is fairly simple to work on. So, what issues are you having?
The biggest issues I see are the fuel pump not having baffles in the tank, the 1-wire O2 sensor that won't work in headers and the custom PROM which is likely not properly tuned for the engine.
Still, it's basically just a stock TBI system which is fairly simple to work on. So, what issues are you having?
Le Mans Master
Joined: Jul 2000
Posts: 6,664
Likes: 162
From: columbia city in
what distributer? if you are using the factory dizzy then you found your problem.The factory computer is no longer being used.
Thread Starter
Instructor
Joined: Sep 2013
Posts: 120
Likes: 1
From: Hattiesburg MS
Terry82, The distributor was part of the Pfisys system. Pfisys tech said he tested all of this when I sent it back and said it was fine. Reinstalled and runs good in shop, little gassy. Take on road, engine light on. Spit, sputtering, have to pat accelerator to keep it running. Have not scanned for trouble code yet.
Le Mans Master
Joined: Jul 2000
Posts: 6,664
Likes: 162
From: columbia city in
great then you have the right computer talking to the right parts.I don't know your system.But on a cross-fire ,if my plugs were sooted and dumping a lot of fuel I would look at the coolant sensor in the front of the motor. that is the one that talks to the computer.does the new Throttle body have a tps ? retest that and make sure you are using the right scale.Clean plugs or replace and start again.good luck
Le Mans Master
Joined: Jan 2001
Posts: 6,741
Likes: 1,383
I would suggest checking the timing mark on your harmonic balancer. If it's off then everything else will be off. (I'm suggesting that perhaps it has slipped).
You need to ensure that "indicated" TDC is "real" TDC.
Looks like a straightforward throttle body system so it should be pretty good and easy to play with. Friend of mine had a 90 Chevy 350 truck with throttle body EFI and it was always reliable and ran well.
You need to ensure that "indicated" TDC is "real" TDC.
Looks like a straightforward throttle body system so it should be pretty good and easy to play with. Friend of mine had a 90 Chevy 350 truck with throttle body EFI and it was always reliable and ran well.
Last edited by carriljc; Aug 19, 2017 at 12:13 AM.
Thread Starter
Instructor
Joined: Sep 2013
Posts: 120
Likes: 1
From: Hattiesburg MS
Put scanner on Vette and took readings. Readjusted TPS and IAC. Rechecked timing with Timing tab disconnected. Set @ 10°. Reconnected Timing Tab. Reset idle speed to +/- 680 rpm. Engine running ok in shop. Took out to road test. Everything good. Engine performance was good. System has self learn and appears to be learning. Just wanted to thank all involved!
Thread Starter
Instructor
Joined: Sep 2013
Posts: 120
Likes: 1
From: Hattiesburg MS
Put scanner on Vette and took readings. Readjusted TPS and IAC. Rechecked timing with Timing tab disconnected. Set @ 10°. Reconnected Timing Tab. Reset idle speed to +/- 680 rpm. Engine running ok in shop. Took out to road test. Everything good. Engine performance was good. System has self learn and appears to be learning. Just wanted to thank all involved!