83 928 stalled and no start
12-01-2009, 11:47 PM
#46
Rennlist Member
On the 84 ign relay, there are two "87" electrodes (might have one 87 and one 87a, thats ok) and one "30". Connect all three.
On the 83, it looks like it might be a single 87 and 30 that need to be jumpered.
If necessary, also then jumper the fuel relay and try to start the biotch.
On the 83, it looks like it might be a single 87 and 30 that need to be jumpered.
If necessary, also then jumper the fuel relay and try to start the biotch.
Last edited by Landseer; 12-02-2009 at 12:35 AM.
12-02-2009, 08:41 PM
#47
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Join Date: Oct 2009
Location: Largo, Florida
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Hi Landseer.
I got the car running today. The fuel injectors were not getting a ground. I read an old post last night from Lonnie G. dated 10-2002. He had the same problem as me, but he replaced the computer and everything else. He figured it out when he was at the end of his rope.
This is from Lonnie G. a Rennlist member.
First post so please bare with me. I have owned this car for a year now, didn't run when I bought it. So far I have replaced gas tank that was leaking. Fuel pump and filter that was missing, plugs, distributor cap, rotor, and wires. Temp sensor II, all vacuum lines, o-rings and boots associated with intake. Ran a compression test, all cyclinders 165 psi, + or - 5psi. Also replaced ignition module. Motor turns over fine, it has good spark and fuel pressure is 40 psi. It is not firing the fuel injectors. Took control unit and tried it in another car and it worked fine. I have bought the full set of manuals and have used the trouble shooting charts to no avail. I have a scope and can see the signal from the ignition to the fuel injection. Power and all signals look to be proper. But it still wont run. Let me rephrase that. It wont stay running. It will run for a second or two then stop. I will not give up on this project, I've always wanted a 928, now all I have to do is make it run. If anyone has any ideas it would be a great help.
Lonnie
Thanks for the reply. I have been fighting with this Bosch L-jetronic for over a year off and on. I have replaced every sensor except for the air flow meter on this car. I bought another control box because everything pointed to that, but the injectors still do not receive a signal to fire.
I am finally going to accept defeat. I am ready to replace the Bosch with something a little more up to date. Something that is programable and alot more user friendly.
Have already put out some feelers on different control units. It will not be cheap, but I'm sure it will run when I'm done. So if anyone is interested in a couple of Bosch L-jetronic controllers for a fair price let me know. Anyway thanks to everyone that offered assistence.
Lonnie
IT'S ALIVE!!!!
I finally found the problem. It was a ground wire. On pin 5 of the ECU is shown in the wiring as a ground. If you unplug the ECU and measure it was open to ground. Traced wire out and found that it goes directly to the temp sensor II. Took a jumper and tied it to ground. Turned engine over and I had pulses to the injectors.
Boy is that a trill after this long! Hurried and put plugs back in and assembled everything else that was loose. Tried to start it and it turned over about twice and then just sit there and ran.
I still haven't give up the idea of swapping out the Bosch for an after-market controller. But I sure feel alot better knowing that the engine is sound. Took a listen to the injectors while it was running and a couple of them don't snap quite as sharp as the rest. Probably wouldn't hurt to pull them and send them out to be cleaned and tested.
Just wanted to thank everyone that replied.
Lonnie
So, I grounded the Tan wire at the Temp 2 sensor and she fired right up. Running great. This no start solution needs to be redistributed on this forum.There are about 4 recent posts with the same symptoms and no start. We are going crazy trying to figure out these no start problems. I dont know why injectors lost the ground to pulse. I checked all the grounds on the car but I could not find the ground for the fuel injectors. I still need to check and fix it right. Before this fix the car did start and run without the FPR, when I tried to plug it in, the car wanted to die. Its fixed for now until further notice.I wanted to say thanks to all that tried to help and a big thanks to Lonnie G.
Joe Flash
I got the car running today. The fuel injectors were not getting a ground. I read an old post last night from Lonnie G. dated 10-2002. He had the same problem as me, but he replaced the computer and everything else. He figured it out when he was at the end of his rope.
This is from Lonnie G. a Rennlist member.
First post so please bare with me. I have owned this car for a year now, didn't run when I bought it. So far I have replaced gas tank that was leaking. Fuel pump and filter that was missing, plugs, distributor cap, rotor, and wires. Temp sensor II, all vacuum lines, o-rings and boots associated with intake. Ran a compression test, all cyclinders 165 psi, + or - 5psi. Also replaced ignition module. Motor turns over fine, it has good spark and fuel pressure is 40 psi. It is not firing the fuel injectors. Took control unit and tried it in another car and it worked fine. I have bought the full set of manuals and have used the trouble shooting charts to no avail. I have a scope and can see the signal from the ignition to the fuel injection. Power and all signals look to be proper. But it still wont run. Let me rephrase that. It wont stay running. It will run for a second or two then stop. I will not give up on this project, I've always wanted a 928, now all I have to do is make it run. If anyone has any ideas it would be a great help.
Lonnie
Thanks for the reply. I have been fighting with this Bosch L-jetronic for over a year off and on. I have replaced every sensor except for the air flow meter on this car. I bought another control box because everything pointed to that, but the injectors still do not receive a signal to fire.
I am finally going to accept defeat. I am ready to replace the Bosch with something a little more up to date. Something that is programable and alot more user friendly.
Have already put out some feelers on different control units. It will not be cheap, but I'm sure it will run when I'm done. So if anyone is interested in a couple of Bosch L-jetronic controllers for a fair price let me know. Anyway thanks to everyone that offered assistence.
Lonnie
IT'S ALIVE!!!!
I finally found the problem. It was a ground wire. On pin 5 of the ECU is shown in the wiring as a ground. If you unplug the ECU and measure it was open to ground. Traced wire out and found that it goes directly to the temp sensor II. Took a jumper and tied it to ground. Turned engine over and I had pulses to the injectors.
Boy is that a trill after this long! Hurried and put plugs back in and assembled everything else that was loose. Tried to start it and it turned over about twice and then just sit there and ran.
I still haven't give up the idea of swapping out the Bosch for an after-market controller. But I sure feel alot better knowing that the engine is sound. Took a listen to the injectors while it was running and a couple of them don't snap quite as sharp as the rest. Probably wouldn't hurt to pull them and send them out to be cleaned and tested.
Just wanted to thank everyone that replied.
Lonnie
So, I grounded the Tan wire at the Temp 2 sensor and she fired right up. Running great. This no start solution needs to be redistributed on this forum.There are about 4 recent posts with the same symptoms and no start. We are going crazy trying to figure out these no start problems. I dont know why injectors lost the ground to pulse. I checked all the grounds on the car but I could not find the ground for the fuel injectors. I still need to check and fix it right. Before this fix the car did start and run without the FPR, when I tried to plug it in, the car wanted to die. Its fixed for now until further notice.I wanted to say thanks to all that tried to help and a big thanks to Lonnie G.
Joe Flash
