NEED HELP FAST - obc issue

[MarkH]

This seems painfully obvious, but when the key is in the run position is there any power at the fuel pump? And if so, is the pump running?

[wastedincome]

yeah Well Dang O dang,
I fuggin fried AND lost.....I don tknow what 2 say ...Scootty WE tried. Me & Matt wan ted 2 c dat ting start more den u. Wes tried.
ding ding riend 2 in da morning?

[wastedincome]

This seems painfully obvious, but when the key is in the run position is there any power at the fuel pump? And if so, is the pump running?

KeyON power IS 2 the relay

[Bimmerfanatik]

This seems painfully obvious, but when the key is in the run position is there any power at the fuel pump? And if so, is the pump running?

I haven't heard a fucking thing happening at the fuel pump.

yeah Well Dang O dang,
I fuggin fried AND lost.....I don tknow what 2 say ...Scootty WE tried. Me & Matt wan ted 2 c dat ting start more den u. Wes tried.
ding ding riend 2 in da morning?

wtf does that say Mark? I don't understand hippie.

:)

We'll crack at it again tomorrow. Fun times.

[MarkH]

Use a voltmeter at the fuel pump to make sure you have power when the ignition is on.

[wastedincome]

I haven't heard a fucking thing happening at the fuel pump.



wtf does that say Mark? I don't understand hippie.

:)

We'll crack at it again tomorrow. Fun times.

Welll Scott I'll leave you 2 figgure dat out. LMAO...Cuz I aint gots a fuckin clue now..times 4 bed

[wastedincome]

damn I wish we hads internet @ da shop.....

[Bimmerfanatik]

damn I wish we hads internet @ da shop.....

werd. this back and forth thing sucks.

[wastedincome]

werd. this back and forth thing sucks.

Yup Well like ANY "well oiled machine" i needs 2 rest and sleep I will pick this back up in da mornin////werd 2 ya mutha

[Bimmerfanatik]

Yup Well like ANY "well oiled machine" i needs 2 rest and sleep I will pick this back up in da mornin////werd 2 ya mutha

nice. call me when you're up killa.

[AdamF 88iS]

Check for spark. If you DO have spark, then the OBC is not the problem. The OBC cuts fuel AND DME fuctions, so no spark.

If you have no spark and no fuel at the same time, it's pretty much OBC, crank sensors, main relay, or DME.

If you do have spark, its fuel pump or fuel pump relay.

Does the car have an aftermarket alarm?

EDIT: the car is an 87, so the main fuel pump is not under the back seat, it's under the car, just ahead of the left rear wheel.

[Bimmerfanatik]

Check for spark. If you DO have spark, then the OBC is not the problem. The OBC cuts fuel AND DME fuctions, so no spark.

If you have no spark and no fuel at the same time, it's pretty much OBC, crank sensors, main relay, or DME.

If you do have spark, its fuel pump or fuel pump relay.

Does the car have an aftermarket alarm?

EDIT: the car is an 87, so the main fuel pump is not under the back seat, it's under the car, just ahead of the left rear wheel.

As always fast and helpful Adam.

As the car was cranking, I pulled the wire off the ignition coil and held it close to the coil, but not on. I had spark.

The ONLY thing that was done differently was the removal of the OBC harness, and the frying of that silly green plug that plugs into the OBC relay box.

I checked the fuel pump relay, even swapped it with a known good one. Still de nada. What are the odds of the fuel pump just up and dying on me with the above circumstances present?

No aftermarket alarm present.

Assuming there's no voltage at the fuel pump...what next?

I seriously HATE chasing down stuff like this. Why, oh why did I mess with it?

[rs4pro3]

those plugs are on the passenger side, by the ecu. The box that went bad on me was the large OBC relay box, that has the 2 green plugs going into it.

[Febi Guibo]

hey, I have a large OBC box here if you want to borrow it... lemme know... can mail today until 11:30 or so.

[AdamF 88iS]

Pop off one of the fuel lines and crank for a second to see if you have fuel pressure. If you have no pressure but do have voltage at the pump then you'll have to get a pump for it.