......help

[FredK]

Glad to hear you figured things out, after some extensive troubleshooting!

[JPStrniste]

PROBLEM SOLVED:


It ended up being a combination of many things.

- bad ground cables at body to motor mount
- replaced with 2 new ones

- slightly oxidized (not sure why cause it was new) wiring harness adapter
- filled the f*ing thing on both sides with dielectric grease and slammed them back together

- bad "new" fuel pump relay
- currently still using jumper wire, will get a new one next week

- bad fuel pump
- replaced with 90 5.0 mustang fuel pump (modified slightly to work). 1/3 of the price of a new e30 fuel pump, btw

- bad fuel
- changed out about 8 gallons of fuel with new 93 fuel and a can of dry gas

- previous owner's alarm system
- not really sure what to say about this. I had ripped most of it out before when i first bought the car. Not sure that this had anything to do with the problem, but i went through and double checked everything i pulled out. I found one relay that i missed, but it was only connected on one side...

- shit luck...
I'm not really sure why all of a sudden i was getting the jumper wire in the relay socket to work and send power to the fuse box, which then sent power to the fuel pump, which was junk anyway.... It was probably just a lot of the little shit listed above that ended up working itself out.


I was pretty close to throwing in the towel and scrapping the whole project. I was just getting pissed at the fact that i couldn't figure out what was going on. I even bought a bav auto code reader to see if that could help me, which it didn't, but i'll have it for the future. I thought for sure my computer was junk and I almost bought a new one. I'm glad i didn't though and the problem worked it's way out as I changed/modified certain things.


At any rate, i ordered the new o2 sensor and it should arrive next week. I've got a brake line in the rear that i have to replace. I'm dropping the car off next thurs to have the exhaust done and I should have it on the road by friday. pretty excited.


thanks for everyone's help.


the search button is a great tool when doing a project like this.

[JPStrniste]

alright,

enough f*ing around. I ordered a code reader from Bav Auto today. should be here by wednesday. Once i pull the codes, if any (there had better be some friggen codes), i'll post up what it is.

[JPStrniste]

i think i've trouble shot everything back to the ecu.

With Key in ON position, i have power at the relay (part of the engine harness) but have no power at the fuel pump fuse (part of body harness).

is there a way to test the ecu, other than plugging it into another car....?

[kevdeno]

Your problem sounds very much like mine. However there are some differences in year car and engine model. Take a look at my thread from about a month ago:

http://www.r3vlimited.com/board/showthread.php?t=106462

My problem was the injectors (All 6 of them). They received signal from the DME, but no fuel squirted. I have come to assume they were clogged because the engine sat for 2 years not running. I bought 6 off ebay and put them in my M50 and it started. Simple fix. Though not a simple diagnosis. It took time.

[JPStrniste]

I tried jumping the fuel pump relay, but I'm not sure if i was doing it correctly. According to the bently, the wire i was jumping were two hot wires when the key was on. I wasn't sure if the e30 and e36 relay socket was the same. obviously the wiring is from an e36 and that's where the relay is.

i've also been trying to search what the wiring adapter layout is. I've got a treehouse wiring adapter that i told him specifically was for a 90 e30 with obd1 m52. I just figured i would double check to make sure the connections and locations were correct.

[JPStrniste]

I tried jumping the fuel pump relay, but I'm not sure if i was doing it correctly. According to the bently, the wire i was jumping were two hot wires when the key was on. I wasn't sure if the e30 and e36 relay socket was the same. obviously the wiring is from an e36 and that's where the relay is.

i've also been trying to search what the wiring adapter layout is. I've got a treehouse wiring adapter that i told him specifically was for a 90 e30 with obd1 m52. I just figured i would double check to make sure the connections and locations were correct.

[FredK]

There's a fusible link inline with a small power wire that accompanies the large power wire all the way from the back of the car. If this gets toasted, I believe it will cut power to the fuel pump relay.

Did you jump the fuel pump relay to see if it turns on like Mossman suggested?

[JPStrniste]

no. i had to jump it a couple times with the diesel truck when the battery went dead. would that have changed anything? ive since changed the battery...

[FredK]

have you ever plugged the battery in backwards, or jumped the car with the wrong polarity?

[JPStrniste]

anybody have any info on this?

voltage at the relay. no voltage at the fuse. obviously no voltage at the pump.

[JPStrniste]

..bump



anybody?

[JPStrniste]

Okay, I'm an asshole.

the injectors would fire if they had fuel pressure to them..... I mistakingly took some weird vibrating for fuel flowing through the lines. instead of pulling the lines off the fuel rail while having the key on. also, i'll be going now to get the inline fuel pressure gauge that someone mentioned earlier....

I know the injectors would fire because a buddy of mine brought over "noid" (spelling?) lights, and each injector would fire whilst turning over the motor.



so, my problem is that my fuel pump is not turning on. I checked for voltage at the fuel pump and didn't get any. the relay is new, and according to the e30 bentley, the fuel pump relay is: "On 6-cylinder engines, the fuel pump relay socket should contain four wires having the following colors; red, red/white, green/violet, and brown/green."(section 6, page 11, left column at the bottom). That was the relay that i changed. However, then i realized that the bentley is for an e30, and the wiring came from a e36, and this relay socket is part of the motor wiring from the e36, so now i'm not sure if that is the same socket.

does anyone have an e36 bentley that can check which one is the fuel pump relay socket? and if it is the same as the e30, then why after changing the relay, does the fuel pump still not work?

also, I'm not getting any voltage at the #11 fuse in the e30 fuse box, which is supposedly the fuel pump fuse (according to the bentley). should i have power here first before it goes to the relay?


thanks

[madjurgen]

Why dont you offer some advice then Mr. Knowitall?

[matt]

All 6 injectors clogged at once? That doesn't happen.