ETM swapping

99_xc70 · Post by **99_xc70** » 28 Dec 2011, 15:30

I checked the injector connectors with the key on and I have battery voltage, running with a noid light it is pulsing. So the ecu is working for the injector side of it. I've even swapped injectors around and still have 1 and 2 dead. I even swapped the entire rail and injectors from the other car and still have 2 dead cylinders.

I work at honda and this is what I do. Most of the cars that come in on a tow truck that have weird problems, no starts, electrical issues I fix them. I've never found a car yet that I couldn't get running, this is a nightmare to me. I've never seen a car smarter than a human before.

No engine light, 200psi, spark, fuel and air. Still have 2 dead cylinders?

Post by **erikv11** » 28 Dec 2011, 21:51

hmmmm ... seems like that only leaves timing?

If it had a distributor cap I would ask if wires to 1 and 2 were reversed ...

Post by **precopster** » 29 Dec 2011, 00:17

Just a thought about this one. What if cam timing were good enough to create compression but just off enough to mistime the spark pulse?

Have you checked cam timing??

Post by **mikealder** » 29 Dec 2011, 00:37

erikv11 wrote:If it had a distributor cap I would ask if wires to 1 and 2 were reversed ...

Swapping the LT connectors between cyl1 & 2 coil packs would have the same effect as screwing up the dizzy cap wiring, well worth trying swapping these over - Mike

99_xc70 · Post by **99_xc70** » 29 Dec 2011, 04:22

So you guys mean swap coil plugs between 1 and 2? Either way one and two cylinders are not working. I tried swapping coils plugs in reverse by swapping coil plug coils around so I could plug #5 coil plug into #1 cylinder, #4 coil plug to #2 cylinder, #3 coil and plug stayed where it was.

So I swapped #1 and #2 coil plug with #4 and #5 coil plug and the car would not start. So I have 200 psi compression but that's with holding the pedal to the floor and cranking it of 6-7 times. 200 psi is it's max compression, normal?

Post by **erikv11** » 29 Dec 2011, 08:27

Sorry for being dense but I can't tell from your post: did you try swapping just #1 and #2 leads, and leaving 3-4-5 alone? That is what we are suggesting. Don't swap both ends of each lead, just swap the end at the coil pack. The idea here is not that the coil wires are bad, you've already shown they can move spark OK. Rather, the idea is that spark is coming down the wire at the wrong time: #1 is sparking when #2 is supposed to spark, and vice-versa.

precopster is suggesting something similar, but due to cam timing not due to miswiring. I don't know if subtle cam mistiming could cause this.

At 200 psi the compression is good, as is your method of measuring it.

99_xc70 · Post by **99_xc70** » 29 Dec 2011, 09:09

Ok I though that's what you meant, just swap 1 and 2 around(coil connector). I think that's what my problem is going to be. Mechanical timing is dead on it's just the ignition timing that seems to be off. I've already swapped cam and crank sensors so the only thing left that has anything to with the electrical side of timing is the ecu. I will try tonight to just swap the two connectors and see if it make a difference.

Post by **mikealder** » 29 Dec 2011, 12:28

Yes we mean swap the connectors on coil packs one and two around, leave the coil packs in place as they are not the issue, just the LT wiring plugs on 1 & 2 then try to start it - Mike

Post by **BEJinFbk** » 29 Dec 2011, 12:39

If it helps, all the injector wire colors for each cylinder
appear in the wiring diagrams available here at MVS:
https://www.matthewsvolvosite.com/volvo-wiring-diagrams/

99_xc70 · Post by **99_xc70** » 30 Dec 2011, 14:15

Alright so I reinstalled the pcv system and intake manifold. Started it up with the same dead cylinder 1 and 2. I swapped coil connectors 1 and 2 as suggested, now it seems only #3 cylinder is working. I can unplug all other coils/injector connectors and no change in idle except for #3 it dies when unplugged.

I again checked the wiring diagram and installed all coil connectors to the proper location by the color of the signal wire. Everyone of them seemed to be backwards. Another shop installed spark plugs for the guy to see if that would help out with in not starting. I fixed the no start problem but it runs like crap.

Anyway I have everything back to were it should be and it seems to be only running on cylinder 3 if that's even possible. This car is insane and needs and engine, harness, ecu which equals a trip to the scrap yard!!