Fuel injectors not spraying
Thread Starter
Le Mans Master
Joined: Apr 2001
Posts: 6,161
Likes: 0
From: Easton PA
Fuel injectors not spraying
Anyone know why my crossfire fuel injectors woin't spray? I replace the fuel relay and the fuses are OK. I'm really stumped and want to get this thing out of the garage. It worked fine when I put it away in November, and all wires appear to be OK. I replaced the ignition module too. Everything works but they still won't spray :mad
Race Director
Joined: Jun 2001
Posts: 16,483
Likes: 1
From: The Only Corvette in Gila Bend, Az.
St. Jude Donor '09
Re: Fuel injectors not spraying (82dukman)
It sounds like the gas has varnished up your injectors.
You might have to disammble them and clean them out... first check the fuel pressure at the inlet to the left injector, if its up then you have the varnish problem...
I think :D
You might have to disammble them and clean them out... first check the fuel pressure at the inlet to the left injector, if its up then you have the varnish problem...
I think :D
Thread Starter
Le Mans Master
Joined: Apr 2001
Posts: 6,161
Likes: 0
From: Easton PA
Re: Fuel injectors not spraying (Desertdawg)
I have great flow when the fuel line is disconnected. A guy who works on our work cars gave me a light module that plugs into the injector leads and lights up when they receive current. i get no light on that thing when cranking. WTF? What does the M.A.P. sensor actualy do anyway?
Pro
Joined: Mar 2002
Posts: 511
Likes: 0
From: St. Louis MO
Re: Fuel injectors not spraying (82dukman)
The MAP sensor is a Manifold Absolute Pressure sensor. Bascially it determines the atmospheric pressure around the car to determine altitude, well for Throttle Bodies Injectors it does. In a newer multipoint injection system like the MPI/TPI/LS-1/LT-1 systems it determines the intake manifold vacuum and is used to help determine the loading situation of the engine at any given point in time.
You may want to check your wires all the way back to the computer. If you have good continuity to the computer and the computer has power you may want to consider having the computer rebuilt. Sounds like your losing power somewhere in the system.
You may want to check your wires all the way back to the computer. If you have good continuity to the computer and the computer has power you may want to consider having the computer rebuilt. Sounds like your losing power somewhere in the system.
Race Director
Joined: Jun 2001
Posts: 16,483
Likes: 1
From: The Only Corvette in Gila Bend, Az.
St. Jude Donor '09
Re: Fuel injectors not spraying (442olds)
Ok There is something else that has to be working for the injectors to pulse DUH!!!
I can't remember right now...
I think it has something to do with the distributer...
And you might want to check the oil pressure switch
I can't remember right now...
I think it has something to do with the distributer...
And you might want to check the oil pressure switch
Thread Starter
Le Mans Master
Joined: Apr 2001
Posts: 6,161
Likes: 0
From: Easton PA
Re: Fuel injectors not spraying (Desertdawg)
I'm getting oil pressure, I can see it on the gauge when I crank it.
On the distributor? There is an ECM connection, battery and tach, and one plug I don't know where it goes. I checked all of those. They are seated and not broken,frayed etc.
On the distributor? There is an ECM connection, battery and tach, and one plug I don't know where it goes. I checked all of those. They are seated and not broken,frayed etc.
Race Director
Joined: Jun 2001
Posts: 16,483
Likes: 1
From: The Only Corvette in Gila Bend, Az.
St. Jude Donor '09
Re: Fuel injectors not spraying (82dukman)
ok Check for spark I think it has to see that before it will allow the injectors to fire
or something like that do you see whaere i'm going ...
I just can't remember what it was exactly, so I'm digging through my book...
or something like that do you see whaere i'm going ...
I just can't remember what it was exactly, so I'm digging through my book...
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Pro
Joined: Feb 2002
Posts: 543
Likes: 0
From: nyc ny
Re: Fuel injectors not spraying (82dukman)
if the car has fuel pressure in the rail and you have power at the injectors you more than likely need a computor. the best way to check is right at the computer there are two terminals for the injector driver circuit. you need the wiring diagram to figure out witch they are.
Thread Starter
Le Mans Master
Joined: Apr 2001
Posts: 6,161
Likes: 0
From: Easton PA
Re: Fuel injectors not spraying (Desertdawg)
here's what i did so far:
Replaced fuel pump relay-bad now fuel into bowls. have spark , checked by plug in boot and grounded at alternator bracket=OK. replace ignition module=OK. all vaccum hoses intact. Checked fuel metering devices at top of injectors for voltage=OK. Fuel pump runs + pumps fuel=OK.
here's where I get lost. I checked everything I can think of. It just sat over winter. I can understand the fuel pump relay going bad buit not both injectors. I am clueless right now. Everything I replaced checks out ok
Replaced fuel pump relay-bad now fuel into bowls. have spark , checked by plug in boot and grounded at alternator bracket=OK. replace ignition module=OK. all vaccum hoses intact. Checked fuel metering devices at top of injectors for voltage=OK. Fuel pump runs + pumps fuel=OK.
here's where I get lost. I checked everything I can think of. It just sat over winter. I can understand the fuel pump relay going bad buit not both injectors. I am clueless right now. Everything I replaced checks out ok
Thread Starter
Le Mans Master
Joined: Apr 2001
Posts: 6,161
Likes: 0
From: Easton PA
Re: Fuel injectors not spraying (One GM A Tech)
if the car has fuel pressure in the rail and you have power at the injectors you more than likely need a computor. the best way to check is right at the computer there are two terminals for the injector driver circuit. you need the wiring diagram to figure out witch they are.
Race Director
Joined: Jun 2001
Posts: 16,483
Likes: 1
From: The Only Corvette in Gila Bend, Az.
St. Jude Donor '09
Re: Fuel injectors not spraying (82dukman)
Well I can't find the trouble shooting chart that I had. :cry
Will have to look tomarrow. hope you get it fixed before then...
Sorry i didn't help much tonight Goodnight :sleep:
Will have to look tomarrow. hope you get it fixed before then...
Sorry i didn't help much tonight Goodnight :sleep:
Thread Starter
Le Mans Master
Joined: Apr 2001
Posts: 6,161
Likes: 0
From: Easton PA
Re: Fuel injectors not spraying (Desertdawg)
Thanks for now. I'm at work and it's 2:45 AM here. probably won't get to work on it too much tomorrow. Let me know if you find it. Thanks again :cry
