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Old 01-11-2006, 11:28 AM   #1
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CEL 1127 and 1129 on the 3.4L

OK I've had a nagging issue on the 3.4 I stuck in my boxster
see http://www.renntech.org/forums/index.php?showtopic=4798&hl=
for details on the swap

Some details
1) the DME was reprogrammed by Imagine Auto
2) the car has supersprint headers and muffler with dansk cats for a 3.2

OK, since doing the swap I had an 1123/1125 error, I assumed it was a bad MAF and bought a new one since the old one had ~70k miles on it

Swapped in the new MAF and now I have 1127/1129 error and some part throttle driveability issues, with the 1123/1125 error it was just an idle problem although it did seem to hicup at around 6800 rpm or so at full throttle.

With the 1127/29 light on, the long range fuel trim is maxed at -32 the pre cat O2 sensors seem to dither properly in range but the post cat sensors also seem to fluctuate out of range, the load signal is at 2% which is too high, the MAF #/min seems in spec but maybe a bit high.
Factory manual says possible fuel pressure or stuck injector problem.

The fuel pressure is fine and I don't think it is a stuck injector problem as it is affecting both sides.

Anyone have an idea? Perhaps the new MAF is bad as well??
Could the Dansk cats not be working as well as they should ?
There is a bit of an exhaust leak at the U-pipe from the cat to the muffler, that i need to fix since the ID of the Dansk cats is smaller than the Supersprint muffler U-pipes. This would cause a lean problem though not rich right.
The oil filler tube has been updated with the correct part.
I think that is all the details.
Maybe I should just drive it over to Imagine and get it on the dyno.
Thanks for any help.

Todd
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Old 01-11-2006, 01:26 PM   #2
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Have you tried talking to a tech over at RUF North America in Texas?
I hear they won't do a 3.4 or 3.6 Conversion in a Boxster unless its at least a 2003. Something to do with electronics not present in older Boxsters
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Old 01-11-2006, 01:35 PM   #3
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Thanks for the suggestion but that isn't the problem. The issue you are talking about is different. You can't stick a 3.6 into the earlier cars very easily. The 3.4 swap is quite straightforward and been done by many companies and individuals.
Todd
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