Car wont start

[iX-treame]

Ok so my buddy Sam came over to my house car working fine, then he realized his Oil Service Light came on so gave him the wire I used to reset mine with, he jumped the wrong ones and then did the right ones. Now his car wont start, it turns over but wont start(no spark or no fuel?), what could be the problem, we are in a bind here.

Car-90 325iS (not that it matters)

[Smatt90IS]

help please could it have killed the computer?

[jlevie]

First check fuses.

[iX-treame]

Already checked fuses, relays, vacuum lines, fuel lines, ignition, coil, fuel pump...seems like no fuel or spark(need to check for sure) so it has to be the computer if thats the case, right?

[jlevie]

Do you know what pins were shorted by mistake. Knowing that would help a lot in figuring what is wrong now.

[iX-treame]

Pins 17 & 19 were shorted, and ive looked and dont know what 17 is.

[Yogawrench]

Did you check the 3 relays underneath a little black cover on the driver's side engine compartment (very near the air box and cruise control unit? Bentley's indicates that relays 1&2 are easy to get fried.

[Smatt90IS]

checked the main relay could it be the speed sensor not working?

[iX-treame]

Did you check the 3 relays underneath a little black cover on the driver's side engine compartment (very near the air box and cruise control unit? Bentley's indicates that relays 1&2 are easy to get fried.

Yea we did that was the first thing we checked

[Smatt90IS]

okay major update im not getting power to the main relay NO CLick i know i have a good relay because its running in my buddys IX

[Fidhle007]

Try swapping his computer in if it's also an I car. Pin 18 is the Motronic so you could have hit that and toasted something but it's still unlikely as most signals are ground signals in my experience. The most likely scenario is that you fried the fusable link in the trunk. The ECU, Diagnostic Plug and all of the injection electronics take power from that side of the block so that's where I'd look first. You should have 12 volts on both sides of the block, if not, you've found your problem.

[Smatt90IS]

Got it fixed it was the power relay in the trunk haha

[iX-treame]

Got it fixed it was the power relay in the trunk haha

Yep all that trouble and it was that simple.