I've got a 90 chevy van T.B.I and the injectores ain't shooting out fuel. I've changed the distributer with a new one thinking that the pick up coil wasn't good still no fuel. This is driving me crazy. Any ideas would be helpfull. I'm thinking T.0P.S. or the fcomputer took a p00 but I'm stumped
t.p.s. c.t.s. could be a number of things, are you getting good fuel pressure to the tbi unit? make sure fuel pump is coming if not check fuses and relays for it. and also check to see if you have any codes.
very intresting going to follow this having the same problem on my blazer
Got flow of gas at the line that comes into the back of the T.B.I. checked both fuses in fuse box under the dash both good.gona try the T.P.S. tommorow maybee its stuck in the wide open position. Can't figure out what other sensor would not let the injectors fire. Any other suggestions would be helpfull. And when I get it fixed ill be posting what it is
I don't have a scaner and don't know how to do the codes with a paper clip
put key in on position, jump terminal A & B with paperclip, count flashes of check engine light, the first set of flashes will be longer then the second.
example: 2 long flashes followed by 3 fast flashes = code 23
the first code you get should be 12, which means normal computer functions, followed by the actual code, then another, and another if there is something wrong, at the end of the sequence it will flash code 12 again
hope that helps :)
K thanks ill try that
Hey bill is this on your black 89? I would check to make sure the connectors on the injectors are making good contact. These are notorious for burning up. I had to replace both of mine. Took me a fee trucks in the junk yard to find a decent set. If yours are f'ed up I may have another good set laying around. Let me know. I have another throttle body sittin here also if you wanna try and rule the injectors out all together.
No its not on my black 89 its on a buddys van. Somebody told me it might be the temp sensore so I think I got another one of those but if not they are only like 10 bucks so I'm going to try that today and go threw the wires to se if any are broke or coroded. If that don't get it id be willing to try the injectores or the whole throttle body you have just to rule them out before I have to look for a computer.
theres fuses for both injectors... instrument panel marked INJ A and INJ B
check for power at the injectors, one should have 12v when ignition is on, other should show ground while cranking/running. should be able to hear them open and close while cranking.... (clicking noise)
bad temp sensor wont cause it to not run, it'll still run but it'll be super rich and run rough. does it run off starter fluid?
Yes it runs when I shoot it. Went and got a set of noid lights and I'm not getting and pulse at my injecters. And the temp sensor didn't do anything. I've looked at the wires and they look good. I think I'm going to find the computer and see if I can find one to try
I'm getting ready to try the paper clip but ain't sure if. The light on the dash works
Quote from: 72 Bogger on March 20, 2012, 03:00:38 AM
I'm getting ready to try the paper clip but ain't sure if. The light on the dash works
supposed to come on when you first turn the key on as a "system check" like all the other lights.
also check the ground wires, to computer, there is 2 of them bolted to the trans bellhousing, where the trans dip stick bolts on, there should be a black wire and a black wire with white stripe. Ive run into the same problem where I got spark, and It fired with ether but injectors wouldnt fire no matter what. untill I finally traced it to those two wires
Well either the light is burned out or the computer is bad cause when I did the paper clip I got nothing
Quote from: xjs3667 on March 20, 2012, 03:08:36 AM
also check the ground wires, to computer, there is 2 of them bolted to the trans bellhousing, where the trans dip stick bolts on, there should be a black wire and a black wire with white stripe. Ive run into the same problem where I got spark, and It fired with ether but injectors wouldnt fire no matter what. untill I finally traced it to those two wires
ive had that happen. the engine to cab ground wasnt hooked up, and it wouldnt run. hooked it up, run good after
Quote from: 72 Bogger on March 20, 2012, 03:33:14 AM
Well either the light is burned out or the computer is bad cause when I did the paper clip I got nothing
check all the grounds, those 2 wires I was talking about will do that, also check the chassis to body ground as jc said
Those two wires look good on the bellhousing and the ground that goes from there to the body looks good. But I'm going to go through a lot of the wires tomorrow and see what happens.I nned to find somebody with a computer that they know works and swap it to see if that's the problem.
check and make sure there is a ground that goes to the thermostat housing. not sure what it is, might be worth a check
I've checked all the grounds I can find they all look good. I'm going to recheck them again. I'm starting to think its the computer. I need to either find one that I can borrow to swap out and check or a scanner.does anybody got either one I can borrow for a day???
Ok, lets start with basics. Still no SES light? If so I'll bet its burnt out. Once that is fixed, then you can go from there. The computer doesnt control the injector pulse, the module under the cap does, along with a few other tasks. Did you replace that yet? Use dielectric grease under it when installed?
i replaced the whole distributer and that comes with a new pick up coil and a new module cause thats what i figured it was. but that didnt change anything. as for the computer controling the injector pulse everybody ive talked to said its the computer. im not an expert on these systems but it shouldnt be this hard or i didnt think it would be.im going to get a scanner from orileys and see what that tells me. hopefully it will give me some kind of idea.i know its starting to piss me off.
What about the check engine light? Does it come on when you turn the key forward?
Quote from: 72 Bogger on March 20, 2012, 05:23:26 PM
i replaced the whole distributer and that comes with a new pick up coil and a new module cause thats what i figured it was. but that didnt change anything. as for the computer controling the injector pulse everybody ive talked to said its the computer. im not an expert on these systems but it shouldnt be this hard or i didnt think it would be.im going to get a scanner from orileys and see what that tells me. hopefully it will give me some kind of idea.i know its starting to piss me off.
I really doubt thats its the computer its self if anything it would be the prom chip in the computer that would be bad,
I may have an extra computer laying around. I'll check tomorrow morn.
Quote from: J.C. on March 20, 2012, 06:01:37 PM
What about the check engine light? Does it come on when you turn the key forward?
No it does not come on at all
Quote from: black07ss on March 21, 2012, 02:41:57 AM
I may have an extra computer laying around. I'll check tomorrow morn.
Cool let me know id apreceite that
Quote from: 72 Bogger on March 21, 2012, 05:23:49 AM
Quote from: black07ss on March 21, 2012, 02:41:57 AM
I may have an extra computer laying around. I'll check tomorrow morn.
Cool let me know id apreceite that
==np ++peace
Well the scanner said that it couldn't read or connect with the computer so either it is shot or there is a broken wire someplace.
I'm assuming you have already double checked both plugins on the computer to make sure they were tight and not corroded??
Ya I've checked all conections and wires. But I'm going to do it one more time and see if I missed anything.
Does the dash get power? Is there any other problems with it?
That's a obd1 and a scanner isn't going to read the computer though it. Most scanners only read obd2 which I don't think they started using till 98. Check the wires by the themostat housing. Make sure there hooked up and not coroded. And also try to unhook the temp control sensor its right next to the themostat housing and see if it will start then.
OBDII started in late 95
Quote from: 73chevytruck on March 21, 2012, 03:42:55 PM
That's a obd1 and a scanner isn't going to read the computer though it. Most scanners only read obd2 which I don't think they started using till 98. Check the wires by the themostat housing. Make sure there hooked up and not coroded. And also try to unhook the temp control sensor its right next to the themostat housing and see if it will start then.
obd2 started in 95
and yes a scanner can work on obd1 if it has the hook up and a good scanner, I have a snap on scanner that will read obd1 and will control all computer functions on obd1 computers
Quote from: xjs3667 on March 21, 2012, 05:06:04 PM
Quote from: 73chevytruck on March 21, 2012, 03:42:55 PM
That's a obd1 and a scanner isn't going to read the computer though it. Most scanners only read obd2 which I don't think they started using till 98. Check the wires by the themostat housing. Make sure there hooked up and not coroded. And also try to unhook the temp control sensor its right next to the themostat housing and see if it will start then.
Go scan it for him! Lol
obd2 started in 95
and yes a scanner can work on obd1 if it has the hook up and a good scanner, I have a snap on scanner that will read obd1 and will control all computer functions on obd1 computers
I would scan it for him but, I gotta fix my scanner first, the power wire in the connector is broke :( so if I get some time ill try and get it fixed. But it wont do much good if the computer wont communicate with it, as it should of flashed the ses light unless its burned out
Quote from: xjs3667 on March 21, 2012, 06:47:00 PM
But it wont do much good if the computer wont communicate with it, as it should of flashed the ses light unless its burned out
Good point
i got the CPU out of my 88 TBI and i dont need it, maybe you could use a new one?
Still ain't figured out the van. Tried a new computer nothing happened. Tried to jump power to the cmputer and the injector fires just not all the time and not at the right time. I put power to the computerby using the ses wire from the connecter for the scanner and the ses light works so I know its not burned out. But I'm out of ideas so does anybody got any? I'm almost positive its a wiring problem somewhere but where?
check the ground wires going to the computer, I believe that they should be grounded on the tranny bell housing, where the trans dipstick is bolted on. also check all the fuse links, and where they connect up on the firewall, see if there corroded or blown I know from experience if just one of them burns then you ca get the same problem you got.