2G Guys I'm looking for help; diagnosing a bog.

miliman13 · Sep 20, 2015

Gentleman, some of you already know me around the site, that being said I like to solve before starting pointless threads like so many new members. But I feel I could use of your assistance.

From one day to the next, I started to bog out around 7psi 3500rpm give it take. I search around tested the common causes. No luck so far.
Please let's get passed the boost leak , some may immediately jump too. I have to many years of boost leaks so it's not that.

So far I replaced plugs and wires.

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I tested the power transistor and got continuity in all cylinders.

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.
I also took pics of my ECU, I don't see anything that sticks out, so I posted pics so you guys can help me check, sometimes capacitors are the cause.

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ECU LAST SERVICES BY ECM IN 2009/2010.

now, I also tested my cool pack at room temp, and unpluged I came in at around 15-16kohms. And plugged in at around 1.3-1.5ohms which is out of speed according to the manual.

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Also I snaked my fuel pressure gauge close to the wind shield to see if it's fuel cut and it doesn't appear so, I base this on the fact that the pressure climbs as the boost climbs which is expected.

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So I'm looking for guidance. I know it will be hard as few DSM guys really get this technical with diagnosing. So any help is good.

Dsmkauai · Sep 20, 2015

Can you post a log of it happening? Are you running a mbc or thru ecmlink and what boost level? Internally gated? What plugs are you running and what gap?

19gsx91 · Sep 20, 2015

The only advice I can offer is this.. When I was inspecting my ECU for damage I saw nothing at all until I took an LED flashlight to it, under regular light I did not notice the corrosion.

Good luck figuring it out.

miliman13 · Sep 20, 2015

.28 gap using link. Sorry no log ecu is out for inspection.
Gate is external, plugged mbc and checked good.

miliman13 · Sep 20, 2015

It's the coil that far out of spec that it could be the cause?. Also anyone know were to look in the ECU?

SasaniFab · Sep 20, 2015

what injectors are you running

oneslowwdsm · Sep 20, 2015

miliman13 said:
It's the coil that far out of spec that it could be the cause?. Also anyone know were to look in the ECU?

That gap is too far out. Also, there is a reason stock wires have little plastic seperator thingys so the wires don't touch each other. While it might not be your problem, it could be in the future. I know my stock wires were getting interference by touching the way you have yours setup. Otherwise, make sure the coilpack is grounded correctly.

miliman13 · Sep 21, 2015

Grounded as in bolted down? Yeah.
Thanks, while highly unlikely, I'll try some seperators for peace of mind.

steve · Sep 21, 2015

There is nothing sticking out as wrong with your ECU, the caps have been changed by someone who knew what they were doing.

Fix those plug wires, what you're doing now will cause misfires/crosstalk. 2 & 3 need to be separated from 1&4. The top of the valve cover has arrows on each cylinder that the plug wires should be pointed so that 2 &3 go in one side of the cover and 1 &4 on the other. You wires may be too short for that but they need to be routed better.

Get a log of the problem.

oneslowwdsm · Sep 21, 2015

miliman13 said:
Grounded as in bolted down? Yeah.
Thanks, while highly unlikely, I'll try some seperators for peace of mind.

It should have a ground wire from the firewall to one of the bolts on the coilpack.

miliman13 · Sep 21, 2015

oneslowwdsm said:
It should have a ground wire from the firewall to one of the bolts on the coilpack.

Nope it doesn't, never did. I'll make sure to add it.

miliman13 · Sep 21, 2015

steve said:
There is nothing sticking out as wrong with your ECU, the caps have been changed by someone who knew what they were doing.

Fix those plug wires, what you're doing now will cause misfires/crosstalk. 2 & 3 need to be separated from 1&4. The top of the valve cover has arrows on each cylinder that the plug wires should be pointed so that 2 &3 go in one side of the cover and 1 &4 on the other. You wires may be too short for that but they need to be routed better.

Get a log of the problem.

I compared it to ecm link photos and nothing does stick out, it still looks pretty new.

oneslowwdsm · Sep 21, 2015

miliman13 said:
Nope it doesn't, never did. I'll make sure to add it.

I'm not sure if it necessarily has to be off the coilpack but there must be one off the intake manifold at least.

See here: http://members.shaw.ca/dsm.1000q/Engineprimer/2G/groundstrap.htm

miliman13 · Sep 21, 2015

Yeah from intake to fire wall, you know what I'll have to check if I ever put it back. Last time I touch the intake manifold was almost a year ago.

miliman13 · Sep 21, 2015

At the current time in looking for a replacement coil pack that meets manufacturing specs. If that doesn't help I'll have to chase other trails

1990TSIAWDTALON · Sep 21, 2015

I've replaced two packs, two vendors and no change on me chasing mine. Mine was new 2000 miles ago so I didn't suspect it but made no difference for me. Just fyi.

miliman13 · Sep 21, 2015

I have heard both , yes and no solution for cool pack. Did you ever put a multimeter up against all 3? I'm looking for one since it's not reading spec!

twdorris · Sep 24, 2015

Must...post...log.

Sorry, but like a few before have said, a log of the problem is a must. I kid you not when I say people can get 50 times more information from a 10-second log showing the problem than anyone could possibly type up trying to describe it. Sometimes you don't even know what to look for in a log until you start looking.

miliman13 · Sep 25, 2015

Downloaded newest version of link. Tomorrow will upgrade firmware.
I plugged up the intake manifold my map sensor was crushed by vibrations, and the DC bars. I suspect this could be the cause won't know until I try again. I cut sheet metal and plugged it up. Also added seperators, as recommended.

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All injectors read the same resistance.

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I check my coil again and honestly it's not too far off.

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Also primary read at 1.2 ohms a little over the 0.77 one should see.

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Also yes, I did ground the manifold.

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Maft also read perfectly at zero, ambient and boiling temp.

Also checked my tps. Checks out at 4.5volts

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Zero leaks in my system, not including the manifold. Will redo again to check.

Why show you all this, well you guys are willing to help, least I can do is cover all bases.
No, when I post the log, we'll know more.

10's or bust · Sep 25, 2015

Check base timing as wellt make sure it hasn't jumped and if you have adjustable cam gears make sure they are still adjusted properly or in spec with your cams respectively

miliman13 · Sep 25, 2015

10's or bust said:
Check base timing as wellt make sure it hasn't jumped and if you have adjustable cam gears make sure they are still adjusted properly or in spec with your cams respectively

covered.

1990TSIAWDTALON · Sep 26, 2015

My problem, I believe,was a bad connection to the MAP. It was notice by another well known member on here. I unplugged it, was sure it was a good tight connection that was clean and my problem seemed to have went away. Maybe luck maybe tune but wanted to post results. Good luck!

miliman13 · Sep 26, 2015

^ thanks, but link can ignore the map correct.
Doesn't it just throw a cell.?

1990TSIAWDTALON · Sep 26, 2015

You are a 2g and although I have one I am not tuning it yet, I'm still tuning my 90 so I'm not familiar with link in a 2g app. Sorry man. Getting that spit out of my tune helped me get to my goal of 500hp last night though!

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miliman13 · Sep 26, 2015

Today I went back and tested the manifold. Little leakage from the 2x bolts holding down my MDP block of plate, I rtv'd them.

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And found a tiny leak coming from my TB bolt, just need to be tightened ( I rebuilt it and must of got lose).

Also cleaned connectors.
Today got as much rest for tomorrow's log.

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2G Guys I'm looking for help; diagnosing a bog.

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