84 Crossfile fuel problems?
Thread Starter
Heel & Toe
Joined: Jan 2005
Posts: 21
Likes: 0
84 Crossfile fuel problems?
I originally posted this in the General Discussion area but was suggested to post here, especially for CFI-EFI. I can't get my 84 corvette with the crossfire injection to start. I started car up and drove to other end of parking lot, half an hour later I couldn't get it started. We took the air filter off and couldn't see any fuel coming out of the injectors as we tried to start it. It would just keep cranking but wouldn't start. We took the fuel line off just prior to the where it goes into the first injector and fuel did come out. Only after we reconnected the fuel line, we saw a little spray for only a few seconds. I've changed the fuel filter, pump and strainer. I can hear the pump prior to trying to start it. Any help is appreciated.
Thanks,
Scott
Thanks,
Scott
Burning Brakes
Joined: Apr 2000
Posts: 980
Likes: 2
From: Chandler AZ
There may be a couple of things going on here.
1. You may have a restriction in a line.
2. You may be out of gas.
3. The FP relay may not be engaging due to lack of oil pressure.
4. There may be a relay problem.
The way to test this is to jumper the socket where the FP relay plugs in. There are 2 small contacts and 2 large. Place a jumper wire in the 2 large female contacts. This should make the pump run whenever the key is in the ON position. If it then starts replace the relay. Worst case you could jumper the FP directly to see if it will start.
The problem may lie somewhere else though. Silly things like leaving the diagnostic jumper in or flakey ignition problems may also make it not start.
Best of luck.
2. You may be out of gas.
3. The FP relay may not be engaging due to lack of oil pressure.
4. There may be a relay problem.
The way to test this is to jumper the socket where the FP relay plugs in. There are 2 small contacts and 2 large. Place a jumper wire in the 2 large female contacts. This should make the pump run whenever the key is in the ON position. If it then starts replace the relay. Worst case you could jumper the FP directly to see if it will start.
The problem may lie somewhere else though. Silly things like leaving the diagnostic jumper in or flakey ignition problems may also make it not start.
Best of luck.
Drifting
Joined: May 2003
Posts: 1,647
Likes: 28
From: Woodbridge NJ
Remove one wire and see if you have spark, if not replace the ignition module. They do go bad and cost under $10.00. I had the same problem last year with my 84, the car was fine one minute and dead the next. I replaced the module and the car has been fine.
Thread Starter
Heel & Toe
Joined: Jan 2005
Posts: 21
Likes: 0
When you say your car was "dead", did the starter turn but no ignition?
I'll look into the ignition module and try some of VAHROOM's suggestions. I do have fuel (about 1/2 a tank). Boy would I be a little red faced if I didn't!
Thanks
I'll look into the ignition module and try some of VAHROOM's suggestions. I do have fuel (about 1/2 a tank). Boy would I be a little red faced if I didn't!
Thanks
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
If you hear the pump for 2 seconds after you turn the key to "ON", the fuel pump relay is working. The fuel coming out of the open gas line confirms the pump is working and it isn't totally blocked. A fuel pressure check would be a good idea. The spec for the Crossfire is 9# to 13#. The easiest way to run the pump for a pressure test is to power terminal "G" in the ALDL with 12 volts. Check the wires to the injectors, while cranking for pulses. No power, check the fuses. With an ohmmeter connected to the two terminals of a single injector, you should have 1.4 ohms or more. Any less and the injector is bad. That'll get you started. Let me know what you find. I have another idea or two if these don't pan out.
RACE ON!!!
RACE ON!!!
Thread Starter
Heel & Toe
Joined: Jan 2005
Posts: 21
Likes: 0
Thanks! I'll check it out as soon as I get back from visiting my son at USC (the other USC - University of South Carolina), It will be a week before I can get to it but I'll be pumped when I get back to try these out. I'll let you know what I find.
This board is really a great source to get/share information
Thanks!
This board is really a great source to get/share information
Thanks!
Race Director
Joined: Aug 2002
Posts: 13,356
Likes: 0
From: tucson AZ
St. Jude Donor '04 & '05
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Thread Starter
Heel & Toe
Joined: Jan 2005
Posts: 21
Likes: 0
I made it home from a week in South Carolina (saw USC beat Kentucky!) with the car sitting idle for the week. I decided to give it a try, not expecting any different results. I remember reading a post about turning the key to the accessories to get the pump going about four times. Then when I turned the key all the way it started! It also started about five hours later. I'm excited it starts now but I am a little hesitant if I actually fixed the problem by changing the pump/strainer/filter becuase it wouldn't start right after I changed them. Any thoughts?
Thanks!
Thanks!
Thread Starter
Heel & Toe
Joined: Jan 2005
Posts: 21
Likes: 0
Sorry I haven't gotten back sooner but I'll run some of the tests i the next couple days. Shortly after getting home from South Carolina I a came down with pnemonia so haven't been able to work on the car. I don't have a fuel guage so I'll pick one up. The test will help ease my mind. I guess my previous statement was more of the question: Was maybe the reason the car didn't start (I only turned it over a couple times) after I changed the fuel pump/strainer because I needed to give it more of a chance to build up the fuel pressure with the new pump (and air in the lines)? When I returned and turned the key four times to the accessories position prior to starting it enabled the pump to fill the line? Just a thought. I still plan to run the tests.
Thanks,
Scott
Thanks,
Scott
Thread Starter
Heel & Toe
Joined: Jan 2005
Posts: 21
Likes: 0
Fixed problem? - Hopefully this time. The car started for me after I got back from South Carolina but as I was testing it, it wouldn't start again in my driveway. I ended up replacing the ignition module and it is starting again. I plan to do more test runs just to be sure. I did finally check the ohms in the wires to the injectors and came up with 1.5 ohms on both. I'm still going to get a fuel pressure guage and going to check that. Thanks all for your help and hopefully my problem has been fixed.
Thanks,
Scott
Thanks,
Scott
