S52 Woes

Post Sat Jul 18, 2009 9:42 pm

Im busy doing a swap and got the motor and harness from the 98 model MZ coupe. Motor is fitted and wired up, car revs up fine but when driving sort of goes into limp mode or something....

btw. its an s52b32 euro
Help Please

Post Sun Jul 19, 2009 5:10 pm

so many variables mate, did yours have the 4 lambda probes? are you still using obd2? try a diagnostic first i reckon. mines obd1 and i done that on a cheapy draper scanner thing, obd2 is a bit more complex i think.

Post Sun Jul 19, 2009 5:56 pm

Try checking the fuel pressure. I had fuel pressure problems when I did mine They run much better with the full pressure. Fit a small pressure gauge that reads to at least six bar and check the pressure with the engine running see if it maintains pressure.

Post Sun Jul 19, 2009 8:39 pm

Thanks guys, it has 2 lamda probes

gonna check the fuel pressure... btw. im still using the stock 325 fuel pump

Post Sun Jul 19, 2009 8:56 pm

Don't B32's run a 5bar fp?

Stock B25 pump won't do 5 bar for long, upgrade time

Post Sun Jul 19, 2009 9:04 pm

e30_Turbo wrote:Don't B32's run a 5bar fp?

Stock B25 pump won't do 5 bar for long, upgrade time

yep 5 bar...... thanks man..... could this cause the limp mode now?

Post Mon Jul 20, 2009 9:05 pm

SAE30 wrote:
e30_Turbo wrote:Don't B32's run a 5bar fp?

Stock B25 pump won't do 5 bar for long, upgrade time
yep 5 bar...... thanks man..... could this cause the limp mode now?

I wouldn't know but Ian Haynes will, he owns the original e30b32 evo and has a working knowledge 2nd to none although I'm sure Brian Moore would give him a good run in a pub quiz

Maybe the lean condition causes the ecu to go into limp home mode, maybe, again I'm guessing.

Post Tue Jul 21, 2009 8:58 am

e30_Turbo wrote:Maybe the lean condition causes the ecu to go into limp home mode, maybe, again I'm guessing.

Sounds about right to me. The engine management will pick up on the low fuel pressure at one or more of the Lambda probes as a high AFR and put her into limp mode - At least that's what I think will happen. I am sure an expert will come along soon.