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Old 07-16-2012, 08:30 PM   #1
tmeh
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Member#: 30800
Join Date: Dec 2002
Chapter/Region: E. Canada
Location: Ontario
Vehicle:
2000 .7 RS

Default 2007 2.5i into GC- rough idle,misfire,issues

Hi, not sure how many people have tackled this..

My car(2000 2.5RS) was rebuilt with a 2007 2.5i engine. We used a rebuilt shortblock. The engine wiring harness was spliced into the body harness(engine harness left intact from the '07). Also includes the DBW system, factory exhaust and intake, fuel sender, all the bits from the 2007. New OEM clutch, RS flywheel. All OEM as much as possible.

It was supposed to be a fairly straightforward ordeal, akin to an STI or WRX swap but hold the turbo and subsequent costs.

There are issues with the car's idling, and it throws misfire codes for all 4 cylinders. Right off the bat it had an O2 sensor code that we found was a bad pin at the ECM, repaired contact and O2 code gone. I left the new O2 sensor installed. Also had a code for AVCS which was fixed with new pressure sensor (common problem). It has thrown one code P2102 for Throttle Actuator, but just one time.

Fuel pressure is >50psi.
New iridium plugs.
Coil pack secondaries checked ok.
Swapped MAF, crank sensor, no change.


Any ideas ??

Maybe next is compression test...
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Old 07-16-2012, 10:48 PM   #2
GrundleJuice
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Compression test is always a good idea when installing a replacement engine. What plugs are those iridiums? Did you double check that the ignition wires are going to the correct cylinder? You said it has the dbw system so I assume you swapped the accel pedal assembly and are using the factory 07 ecu that was in the same chassis that the donor engine came from?
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Old 07-20-2012, 08:47 AM   #3
tmeh
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2000 .7 RS

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I'm not certain which plugs went in, I'll double check today...

Wires are definitely going to the right cylinders.

DBW pedal went in from same 2007 2.5i as ECU/intake/heads

thanks for the reply!
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Old 07-20-2012, 09:47 AM   #4
GrundleJuice
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Quote:
Originally Posted by tmeh
I'm not certain which plugs went in, I'll double check today...

Wires are definitely going to the right cylinders.

DBW pedal went in from same 2007 2.5i as ECU/intake/heads

thanks for the reply!
Some have had problems with different types of plugs, even though they are the correct gap, heat range, etc. but I think those problems were less inhibiting, like the occasional misfire. The ngk laser platinum, FR5AP-10, is the oem plug from the factory. (the parts book/owners manual calls out the -11 but that is already on the high limit of the gap range, the -10 is the correct plug)
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Old 07-20-2012, 09:57 AM   #5
J.Gibbs
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Personally I run the NGK laser double platinum and love them. Made a world of difference when I swapped them with the cheap autolite plugs the PO was running.
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Old 08-01-2012, 01:40 PM   #6
tmeh
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So, changed from iridiums to platinums, new coil pack, new wires, compression test ok, cleaned throttle body, no change in idle. Didn't throw a misfire code but still doesn't idle properly.

PITA

Going to try another throttle body next...
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