no spark or injector pulse after upgrades??? (redtop sr20det)

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brndck
Posts: 424
Joined: Thu Jan 23, 2003 4:05 pm
Car: getting crazy with the cheese whiz

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cliff notes first:car started/ran fine yesterday (redtop sr20det with #62 ecu), then i installed the following-550cc sti injectors -t28 s14 turbo-z32 maf (wired per heavythrottle)-tomei #62 ecu reflashed for z maf, t28, 550 cc injectors

NOW i have no spark at the coil packs and no pulse at the injectors, ecu is showing code 11 (crank angle sensor). if i switch back to my old mines #62 ecu, car still has no spark and no injector pulse and shows same #11 code.

so far i have rechecked all my wiring for the new injectors and the z maf, as well as tracing all the wiring for the cas, tps, maf, injectors, etc to make sure there were no shorts or exposed wiring or anything. i am still getting plenty of fuel pressure. i've checked all of the pins on the ecu that are cas related and i am still getting a start signal from the ignition.

i don't have any sort of oem test procedure for the cas, but it is getting power and ground and when you crank the engine, it does produce a 5v reference signal so i don't think it is actually bad.

any suggestions or does anyone in socal have another cas i can borrow for testing/possibly buy?


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Infinitiguy19
Posts: 7787
Joined: Sat Dec 22, 2007 4:58 pm
Car: 1993 Infiniti Q45 188580 Miles
1994 Infiniti Q45a 240000 Miles

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Makes sense that neither the injectors or spark plugs work because the CAS (Crank Angle Sensor) controls them!!!

So make sure the CAS is in good working order (Plugged in, set correctly...).

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brndck
Posts: 424
Joined: Thu Jan 23, 2003 4:05 pm
Car: getting crazy with the cheese whiz

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replaced cas and ignitor with known good ones, still same troubles....

rioredstang
Posts: 293
Joined: Sun Nov 30, 2008 3:47 pm
Car: 1993 240sx SCCA ITS
Location: Chattanooga, TN

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You need to use a volt/ohm meter and ohm resistance of each wire from cas to the ecu. Sounds to me like you have damaged a wire in the harness somewhere.Check for power and ground to dist.

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brndck
Posts: 424
Joined: Thu Jan 23, 2003 4:05 pm
Car: getting crazy with the cheese whiz

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I've traced all the maf and cas wires from the ecu to the sensors and haven't found anything suspect. I've ordered a new engine wiring harness already but I'm not holding out much hope that this will be the solution.

This weekend I'll be trying my ecus in a friends car to see if they are burnt or not.


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