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Old 10-27-2015, 11:43 PM   #1
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Default More fail cyl 2 and 4 dont seem to matter

Ok so I am working to get the new engine running (diypnp) good at idle and I have tried new coils, injectors and firmware but it still is running on 2 cyl
So when I pull the coil on #4 the back most cyl nothing changes. When I pull #2 nothing changes. pull 1 or 3 and it dies.
I have listened to the injectors and they are firing. I have spark all 4 coils tested with light and extra plug.
Its the stock wiring for the injectors and changing to fab9 cop didn't help.
Sure seems like I am running on more cyl than 2 when driving.

Some times pulling the wire of # 2 seems to effect it but it really runs about the same at idle with 2 and 4 pulled as it does with the wires hooked up.
Same with pulling #4 injector plug.

Bought engine having seen it run and with compression test.

I am out of ideas.
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Old 10-27-2015, 11:59 PM   #2
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Your issue is with the injectors. #2 and #4 are batch fired in 90-93 non-CA cars. Figure out why the injectors aren't firing and your problem is solved.
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Old 10-28-2015, 01:23 AM   #3
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That interesting.
Wonder why I thought 1&4 and 2&3 like in the ignition.

Well on a side note it's something to do the vvt tuner. If I take it out of the loop the thing Req alot more fuel but it idle without missing and pulling 2 or 4 effects the idle. Plus afr are some what steady with in 1 point.

Will work on it tomorrow.

Sav man thanks that will give me some place to look.
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Old 10-28-2015, 01:35 AM   #4
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What could cause the interference.
It only works to unplug vvt box completely. Unplugging at vvt valve doesn't stop the problem but does change idle.

Any ideas
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Old 10-28-2015, 01:24 PM   #5
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output test mode.
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Old 10-29-2015, 02:24 AM   #6
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Output test mode?
I will have to search that.
3 wires are shared between vvt tuner and diypnp
Signal
Positive
Negative

Ground issue?

I know there was a lot in the vvtunner instructions about grounds but that was 3 yrs ago. I will have to read thru again.
I also noticed the diypnp install instructions have been update with a post about 5v and a resistor.

I will contact them for more direction.

Thanks for yalls help.
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