Is this the correct ecm

[PaulRV6]

I got this ECM from rockauto and I want to be sure it is correct and will work. So far I am having trouble getting a spark at the plug. Put the plug against ground to check and zero spark. Then led me to think of the ECM. Unless I can't check the spark in this manner. Thanks

 

[PaulRV6]

Sorry forgot to attach photo.

 

[jckcolarusso]

crank sensor will cause no spark and ignition module

 

[Anthony P]

yes, correct part # for ecm. it's the updated # from the factory 122-7148. It's the one I suggested you get.

 

[PaulRV6]

Ok thanks Anthony. I didn't remember that but I did buy the one you suggested. Just trying to figure out why no spark unless I can't check it the way I thought.

 

[THensley]

I have never had a crank sensor fell and all my no start were cam sensor.

 

[PaulRV6]

ok thanks. What about checking for spark by holding plug to ground? Is this still valid on this type ignition system? I am going to check crank sensor wiring since I remember reading something about the factory wiring diagram being wrong.

 

[GNVenom]

ECM has nothing to do with startup spark. Cam and Crank sensor both have to be functional to initiate a spark. Two fuses relative to the ignition should be checked.

 

[TurboTGuy]

ECM has nothing to do with startup spark. Cam and Crank sensor both have to be functional to initiate a spark. Two fuses relative to the ignition should be checked.

Check the fuse to the ECM by the Battery, too. (Orange wire)

Ya never know with these cars...

 

[PaulRV6]

Ok so I found out I have spark just no fuel. After cranking it for a while I checked 2 of the plugs and they were dry. I did a continuity check of the wiring to the injector terminals and all seemed good to those. I have what I think is a good ECM and a stock 87 chip w/o calpack chip. I guess I need to look over the wiring diagrams more.

 

[PaulRV6]

Just another thought. What if the park / switch was not hooked up or if it's an open circuit, would that cause a no start, no fuel? Thanks

 

[THensley]

No fuel is CAM sensor cap If it a OE no light on top that can fell if it a Caspers wit red light it can fell too but the light will not flash.
OE caps without a light is almost imposable to find, Lots of people don't have nice thins to say about Caspers But tell you fork over 750 bucks for a CRUZ cam sensor Caspers is all you have to use. I have used one for 15 years and 30K miles before it felled.

 

[pacecarta]

cam sensor will not stop fuel pump , prime is irrespective of any sensor
pump run after prime is dependent on RPM

pump can be powered seperate of the ecm to establish fuel pressure above 26psi , you claim to have spark and if still no fuel and you have injector pulse (buy a frickin noid lamp ) then it should pop unless the injectors are locked up
you can spray starting fluid into the tb and if it pops and runs briefly then its a fuel delivery issue , if it wont you have to go back to spark ignition

steve woods no start tree

No Start Tree

 

[THensley]

I made the mastic and thought he has fuel pressure without even asking if he dose.
Paul DO YOU HAVE FUEL PRESSURE ?

 

[PaulRV6]

Oh yeah, the prime works and then shuts off and when I start cranking the fuel pressure goes back up to 40 psi. I would have thought to see fuel on the plug tips if the injectors were working. I pulled a plug and it was dry.

 

[THensley]

OK we have established you have fuel pressure. If you' do not have a Noid light to test. Im sticking to my original post cam sense cap.

 

[PaulRV6]

Well I got it to start but it stalls immediately after that. I think it is only starting on the prime. It did that quite a few times and now I have no start. I am going to try the noid light test on the injectors bc it seems like it is not getting the fuel after start. For some reason after a few starts like that its back to not starting. I have plenty of fuel pressure so its not pump related.

 

[PaulRV6]

I just did the noid test on number 1 injector and there is no light. So what is that telling me? I know the cam sensor is good bc it worked with my old stand alone DFI but recently changed to stock computer setup.

 

[THensley]

mine worked all night 5 or 6 starts 2 passes and then no start 2 cars from the water box.
IHADAV8 vortex sight no longer works so your own your own sense you know the cam sensor is good .and on the no start tree this is the branch I would picking fruit from.

 

[pacecarta]

fyi i hate when the story gets bits of info only after a dozen back and forths and now we learn its a DFI conversion

something to be aware of when doing a dfi conversion is the dfi used MAP for fueling , but it did it by sending the map signal into the MAf wire to get to the ecm harness sometimes it used a jump harness similar to the alckycontroll harness but it conencted to the maf plug or may be wired into the maf signal wire , if you didnt disconnect the map sensor signal from the MAF wire you get a map and maf signal on the same wire and it wont stay running ..try unplugging the three bar map sensor as long as the wire to ecm wasn cut to splice in the map you'll now have a clean maf signal

if you set this engine up from parts want it to stay running you still need tps and iac set properly( iac can be set after start but throttle door needs to be close to where it needs to be to start) and a properly functioning MAF