850 surge/lag under load

Post by **jblackburn** » 03 Oct 2011, 17:22

Tackling car problems with a sense of humor. I like your style!

There are two methods to go about the flex pipe - have an exhaust shop weld a similar one in place, or replace the entire exhaust manifold with an aftermarket one (OBX, for instance).

Post by **Fish stick88** » 03 Oct 2011, 20:01

Im having a similar problem, which i think is from drag on the SERP belt. I notice it when i turn on my headlights, run the AC compressor (Especially) I am also having very hard starts about 4-6 seconds, Typically, I can start up on first turn. the weather is getting a bit chilly here..

shegarty · Post by **shegarty** » 07 Oct 2011, 07:55

looks like a good discussion going on here - on the topic of the MAF in may case, it is a replacement part from the previous owner - i am concerned now that it might not be the correct part number as i have read that they are quite picky - is there any way (other than calling the extremely unhelpful local dealer) of findind the correct part number for my particular car???

Post by **jblackburn** » 07 Oct 2011, 07:58

93-94's apparently look like this and don't come in the whole tube assembly:

http://www.fcpgroton.com/product-exec/p ... 28Bosch%29

Part numbers: 1366220, 0280217002

All you should really be concerned with - does it say Bosch!?

shegarty · Post by **shegarty** » 07 Oct 2011, 09:55

some conflicting info from FCP - your reference quotes part no: 1366220, 0280217002 from FCP Groton but FCP Euro quotes part no.: 1275749, 0280217107 , W0133-1600936 - why is there a difference? is it simply the housing which comes with the FCP Euro part?

Post by **jblackburn** » 07 Oct 2011, 09:59

Oh, you're right - I didn't see in your signature that you have a 94 turbo - just saw '94' at the right.

The one I put up is for a 93-94 non-turbo. Ignore that.

shegarty · Post by **shegarty** » 07 Oct 2011, 10:31

makes sense - will try one from the wreckers before thinking about ordering a new part - things are much better now with all of the repairs and only noticeable when cold under load - will update ...

Dot Heton · Post by **Dot Heton** » 10 Oct 2011, 00:32

My 94 turbo has the same thing going on. I was thinking that the fuel injection was hunting for the correct mixture, leading me to think it was an O2 senser.

shegarty · Post by **shegarty** » 11 Oct 2011, 10:05

while doing some unrelated work (oil change and drain and refilll tranny) on the weekend i tried disconnecting the MAF again and driving uphill under load (when problem is most noticeable) - it would appear that the demon has yet to be vanquished - surge is still evident and worst at around 2500 rpm

car idles fine even when cold with none of the surging that one would expect if the IAC was bad - IAC has disctinctive hum/buzzing but from what i have read this is normal and should not affect performance

any ideas on what else i can look at????

Post by **jblackburn** » 11 Oct 2011, 10:27

IAC valve shouldn't cause any of that.

When's the last time you changed plugs? When my gap was off, I could feel the car stumbling around, but it was at a higher RPM.

O2 sensor could still be a candidate for surging behavior.

850 surge/lag under load

Re: 850 surge/lag under load