weired idle

[epowers777]

Ok here's my update. We did every test in the book. My POP test passed flying colors. The injector test were it cuts them off at idle failed miserably. He states the first 4 cylinders in the firing order failed the test. I think 1-6 8-5 failed. So he thinks my computer that runs the injectors are bad. So he gave me one and I tested it. It ran great idled great even pulled the chip and idled smoothed. Drove about 18 miles and it started again but not that bad. So he want me to drive it for a couple of days and we will test it again.

Cody here's the numbers icp v .80 - .88 at 480 pressure at 12% we didn't get the idle sorry.

Let me know what you think. And he thinks it has the wrong computer in it. He thinks its a early 99 computer with a late 99.5 engine. We will swap computers later.

[epowers777]

I was wondering if someone could give me the schematic so I can test the wires from the idm to the actual injector harness. I think I may have a brake in the wires. And is there a way to test the idm?

[907DAVE]

To check the injector circuits on the left side of the engine, put one lead of an ohmmeter to IDM pin 23 (Pink/Yellow). Then take the other lead and go to pin 22 (White), pin 7 (Brown/Light Blue), pin 19 (Light Green/Orange) and pin 9 (Light Blue). Each reading should be between 2 ohms and 5 ohms.

To check the injector circuits on the right side of the engine, put one lead of an ohmmeter to pin 24 (Orange), then place the other lead on pin 6 (Tan), pin 21 (Brown/Yellow), pin 8 (Tan/Black) and pin 20 (Tan/Red). Again, each circuit should read 2-5 ohms.

[epowers777]

Dave is this the actual idm plug or the engine harness plug for pin 23 and 24 correct?
And the other pins you unplug the under valve cover harness?

Thanks Dave. What do you think about my findings with the scanner?

[907DAVE]

Originally Posted by epowers777

Dave is this the actual idm plug or the engine harness plug for pin 23 and 24 correct?
And the other pins you unplug the under valve cover harness?

This is with the IDM disconnected and everything else attached, testing from the IDM connector.

Originally Posted by epowers777

Thanks Dave. What do you think about my findings with the scanner?

It is really hard to say about the CCT faults, with aftermarket injectors I would not put a lot of faith in the test.

How many times did you run the CCT....was it consistently flagging the same cylinders?

[epowers777]

He ran it like 8 times yes it flagged the same cylinders . He told me the same thing that they aren't that accurate so he ran it a bunch of times. He was thinking those cylinders shared the same coil or something in the idm.

I was reading about the injectors that if you take the top cover of the injector there's a plate you remove and under the plate there's a nut and if they become loose you get ruff idled and will fail that test. Do you think they are loose since there brand new injectors?

[epowers777]

ok I ohmed my IDM harness. everything was within 3.0 and 3.3 except Pin 22 it read 95.4 ohms. So Im guessing i got a crack so im hunting for it.