Car has spark and no fuel. I used the exisiting 2 injector wires and ran 2 seperate to the ecu.. didn't work. Then i ran 4 seperate wires (brwn,red,blue,yellow) in sequence a1.a3.a5.a7 then ran a seperate power wire to pin a15 and tied that into where the resistor box should be (the car is using obd1 ecu and injectors). Still doesnt work... any body have any ideas?

 

 

Did you convert the entire ECU harness to OBD-1 and did you switch over the distributor to OBD-1?

 

The car is a dx.. im using a obd1 ecu, obd1 distribtuor, obd1 injectors on a 95 z6... and its on a jhp obd1 jumper harness. As far as the wiring goes.. its the dx harness i used the exisisting 5 dizzy wires and ran two seperate to the ecu.. the car starts when i use starter fluid. So thats how i knew it was a fuel problem.. I tried using the exisisting injector wires and adding the two.. but that didnt work so i ran 4 seperate ones from each injectors then ran the yellow/black wires to the a15 power wire because i cant use the resistor box with these injectors.

 

tttttt

 

 

 

yea huh

 

Injectors won't fire if ECU is getting improper information from a sensor. An example was a friends recent MPFI OBD-1 Combo Conversion that two of the Distributor sensors were swapped accidently (ECU Harness issue). Had Spark, Air, Compression, but no injector fire. checked the distributor wiring, swapped pins and click click went the injectors. FYI, CEL never came on for this. So I'd start there and then double check other major sensors like MAP, TPS.

 

is the ground wire from the harness connected at the thermostat housing?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jlicrx &raquo;</TD></TR><TR><TD CLASS="quote">is the ground wire from the harness connected at the thermostat housing?</TD></TR></TABLE> yes if it wasnt the fuel pump wouldnt come on..

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BlueCrxNC &raquo;</TD></TR><TR><TD CLASS="quote">Injectors won't fire if ECU is getting improper information from a sensor. An example was a friends recent MPFI OBD-1 Combo Conversion that two of the Distributor sensors were swapped accidently (ECU Harness issue). Had Spark, Air, Compression, but no injector fire. checked the distributor wiring, swapped pins and click click went the injectors. FYI, CEL never came on for this. So I'd start there and then double check other major sensors like MAP, TPS. </TD></TR></TABLE>

I had some trouble wiring the obd1 plug onto the harness at first but i finally got that right.. I can start the car right up if i use thrust or starter fluid. I don;t know what colors i should be looking at to change around cause i did everything the way its said to be done. I'm gonna try a main relay along with a stock p28 today and see what happens its really bothering me cause i've done this a few times and never had a problem

 

The CYL and CRANK sensors were swapped.

Per Helm's OBD-1 Pins:
CRANK: B15 (BLU/GRN) & B16 (BLU/YEL)
with
CYL: B11 (ORN) & B12 (WHT)

The wires on the conversion harness were in the wrong spots in relationship to the cars harness in our case. Hope you get it figured out. I hate issues like these. I hope it's not bad injector driver(s) in the ECU.


Modified by BlueCrxNC at 11:30 AM 5/18/2008

 

car starts with starting fluid its not the disitrbutor... and i tried changing those wires and it made it worse lol.. I ran the injectors straight to the ecu.. in sequence then ran the other 4 to the resistor box and a seperate power from from pin a15... checked all the fuses all the grounds and still nada..

 

Starts until starter fluid runs out or runs afterward as well? Have you tried new injectors/resistor box? Tried another ECU yet?

 

Well I thought it was until it ran out of the starter fluid.... but i tried turning it over today and it putters now but not often..but it doesnt run.. before that i didnt get anything out of it.. i tried using a resistor box.. then with out since they are obd1 injectors. Tried 3 ecu's and a main relay

 

Well, considering you've rewired, tried multiple ECUs and other items, it's sounding more like your injectors. Are they known working (worked in past for you)? Do you have access to a multi-meter to test the resistance on the injectors? You gotta be very frustrated man LOL. If they really are Saturated injectors should fall between 11-12ohms; if they were peak and hold should be around 2 ohms. After you test them, if they are in spec, I'd test fire them just once very quickly by running 12v and ground to each individual one.

 

frustrated isnt the word.. lol I'm gonna take one more stab at this with some obd0 si injectors and use the resistor box.. if that doesnt work then i give up