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What to try next - ECU??

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Rick

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Apr 28, 2011, 7:06:21 PM4/28/11
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84 944
Symptoms:

Engine Starts
Idles low and rough
bogs out when given gas
afm clatters at times
radiator fan that stays on till engine is cool never shuts off
other radiator fan doesn't come on
drove it around the block
shuts off at stops
have to gun it to get going

changed dme
changed afm

what to change next?

All help appreciated

Rick


bill noble

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Apr 28, 2011, 11:59:49 PM4/28/11
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check for air leak. Check timing before starting it again, slipped
belt will do this. most probable is a cracked J tube (the rubber
intake). Dirty injectors do this also.

Only one fan runs normally -- it takes AC on to activate second fan.

Rick

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Apr 29, 2011, 5:58:06 PM4/29/11
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> Only one fan runs normally -- it takes AC on to activate second fan.- Hide quoted text -
>
> - Show quoted text -

Bill,

Thanks for the quick reply,

I did not mention that I had replaced the J tube already.

I had busted the old one. I'll check installation of replacement.

Another forum said potentially replaced dme with wrong model dme.

What are your thought on this?

896369 # on original

89 8892 000 # on replacement

Thanks for the assistance

Rick

Rick

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Apr 29, 2011, 8:20:19 PM4/29/11
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> Rick- Hide quoted text -

>
> - Show quoted text -


AFM PART NUMBER
ORIGINAL AND REPLACEMENT
0 280 202 028

Porschetek

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Apr 30, 2011, 9:14:29 AM4/30/11
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replace rad fan switch
remove oxigen sensor and CO test tube, rev engine. revs freely? bad
cat
idle engine and spray brake clean over injector and intake manifold
area, idle increases? vacuum leak from inj o-ring or manifold gaskets
Try this and see what happ's

bill noble

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May 3, 2011, 8:36:28 PM5/3/11
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download pet6, it's available on internet, that will let you check part
numbers and will let you verify the DME is correct - later DME or S DME
won't work
The AFM is not the same for the early cars as for the later, so make
sure you have the right one.

The suggestion to check CAT backpressure is a good idea too, but I don't
think that's the problem

Check injectors and make sure they all squirt out the same amount of
fuel - a stuck injector or two would make it not work right

Rick

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May 14, 2011, 10:44:39 PM5/14/11
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To all:

Thanks for all of the ideas.

Issue found>

When the J Tube was replaced, all fitting were checked and were tight,
however,

When tightening the fitting that goes from the J Tube to the breather,
the tube came off the breather. Allowing free air flow.

The tube that attaches to the breather was resting on top of the
breather, so it looked attached.

Simple Simple Simple

Well at least I have some replacement DME's on hand for future use.

Rick

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