Only firing on 2 cylinders?

WarmAndSCSI · 12-19-2007, 07:28 PM

Yes, there is an ignition failure circuit built into the modules. The ECU should be popping a code. Check the resistance on the two wires first. They could be absolutely dead. Since they're so short, I'd say anything above 10,000 ohm and they're toast.

**skipjim** · 12-19-2007, 07:34 PM

We ran a scanner on it yesterday and it really didn't come up with anything.

My buddy is supposed to be checking the wires before he tears the top half of the engine apart. He's turned the motor over with all four plugs pulled out and all four are getting spark...

**RedGalant2k1** · 12-19-2007, 07:35 PM

Technically it should be throwing a code, but that doesn't mean it actually will be. I have some of my companies shops up in the Grand Rapids area that just got nice shiny new Snap-on Solus scanners. We have a Modus, and Mac Tool equivalent at ours 8)

In any case have you tried switching the wires yet? Or tried testing the coil packs to ensure those are working and you are getting spark?

Btw, the ignition module sparks two cylinders (those with coil packs) which would make sense that two are not firing, and coincidently the ones with coil packs..

WarmAndSCSI · 12-19-2007, 07:46 PM

The coil packs spark two cylinders - the host cylinder and the cylinder where the spark plug wire runs to. I'd expect one cylinder without a coil pack and the one connected to it to be misfiring.

**skipjim** · 12-19-2007, 07:53 PM

The two directly connected to the spark packs are the two that are firing. The other two, that run off the wires are the ones that aren't firing.

I wanted to spend a bit more time there tonight but my wife & son were with me tonight and they don't seem to see the draw in impact wrenches and oil for some reason (I almost had my son but there was this puppy you see....).

I'd really like to get this car back on the road, it's been an abuse victim in it's lifetime and it needs to rehabilitated. Some of the idiotic things I've repaired on this car over the last few years would scare you (the front coil springs were heated to lower the car, and the guy didn't even do that right). Don't get me started on what my wife has done to it....

**duh2150** · 12-19-2007, 09:01 PM

hahahahahaha! lololololollolololol! hahaha loo kat your wiring dude! the wires from coil pack 2 goes into 3 and coil pack on cyclinder 4 goes on cyl..1!

look at your second pick down

and look at my wires

keep the plugs in the same thing just connect them to the other packs swap them around

cylinder 2 should go with cylinder 3
cylinder 4 should go with cylinder 1

:)

**duh2150** · 12-19-2007, 09:15 PM

an d htye your spark plugs arnt sparking,, if you took them out they aint gonna spark you have to ground them out, i dont thin kyou grounded them, thats why theres a ground on the engine connected ot the block

WarmAndSCSI · 12-19-2007, 09:16 PM

Originally Posted by duh2150

an d htye your spark plugs arnt sparking,, if you took them out they aint gonna spark you have to ground them out, i dont thin kyou grounded them, thats why theres a ground on the engine connected ot the block

I hope you're right about this

**duh2150** · 12-19-2007, 09:35 PM

well its a guess i donno if he really groudned it or not but im assuming, plus his wires are dif in the wrong palce

**skipjim** · 12-20-2007, 08:56 AM

I hope he's right too!

Although that'll mean I'll need a place to bury a body.....

Hopefully I'll hear something around lunch time.

It still doesn't fix the low compression deal, but it does (hopefully) get the car running until tax return time.

**duh2150** · 12-20-2007, 09:52 AM

and for compression, put some umm, of that thread not stick sut, i forgot hat its called, not lock tight! so you can remove them easyer later, might hel pa bit if its leaking at the spark plug

how many miles do you have?

WarmAndSCSI · 12-20-2007, 09:54 AM

Originally Posted by duh2150

and for compression, put some umm, of that thread not stick sut, i forgot hat its called, not lock tight! so you can remove them easyer later, might hel pa bit if its leaking at the spark plug

how many miles do you have?

Aaron, you're an idiot. Seriously.

He's getting ring sealing issues. You DO NOT leak through the spark plug holes. I've never seen that EVER. The compression tester has an o-ring on it anyway to seal against the back of the head.

It's called anti-seize and it's purpose is so the spark plugs don't get fused to the aluminum head during heat cycling.

**skipjim** · 12-20-2007, 11:32 AM

It lives!!!!!!!!!!!!!

When we get it back together and running maybe we'll figure out the compression issue!

Dang spark plug wires...

WarmAndSCSI · 12-20-2007, 11:35 AM

I can tell you right now you're not going to "figure out" your compression issue. So long as the test was done correctly, it's probably ring sealing. Small drops in compression are always indicative of ring sealing issues. Do a wet test to confirm this: drop a capful of oil into the low-compression cylinder, wait several minutes, then test its compression. It should come up to be roughly equal with the two healthy cylinders. Do NOT pour too much oil in as this will ruin the check valve on your compression tester (I've done this twice now

).

**skipjim** · 12-20-2007, 04:21 PM

We had some hope that the low compression test was more due to the amount of gas being sprayed into the cylinder and not burning....

At this point I'm just happy to have wheels again :)

**duh2150** · 12-20-2007, 04:24 PM

yeah im pro lol

WarmAndSCSI · 12-20-2007, 04:27 PM

Originally Posted by duh2150

yeah im mentally deficient lol

**duh2150** · 12-20-2007, 05:15 PM

lol screw you too warm dude lol, i fixed his car didnt I!? when it took a full page of "noobish" answers, i am master pro!!!! lol from the "Land of Gonan!"