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Most Likely Source of a Code 1-1-3? 850 1994

posted by RepairmanJackal on Sat Mar 9 18:25 CST 2013
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last visit: Tue Jun 10 09:52 CST 2014

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The list of problems on this 850 is getting shorter. Knock sensors have been sorted, PCV system renewed, all vacuum hoses have been re-attahced, the horn is functional, engine is 600% cleaner. Once I replace my tie rod ends and get the engine running smoother and I should be ready to roll.

I cleared codes today - managing to silence the CEL and Service lights.

Unfortunately the car is still running a bit rough, and after letting the engine warm up for a while, I found my CEL had returned.

This time A6 gave me 1-1-1 (knock sensor code 1-4-3 did not come back), but A2 now returns a 1-1-3. This is new, so it must be something I did when I have the manifold off.

It seems that 1-1-3 is a lean mixture error, which screams vacuum leak. I've checked vacuum hoses but I don't see or feel anything wrong.

Any thoughts on the most likely source of this problem?

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ANSWER Most Likely Source of a Code 1-1-3? 850 1994

posted by KlausC on Sat Mar 9 20:19 CST 2013
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last visit: Fri Oct 24 10:15 CST 2014

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You are going to hate me for saying this, but since you had the intake off you will need to check the manifold gasket for leaks. Then take a good look at the base of the vacuum tree, it has a rubber O ring that might disintegrate.

Inspect the vacuum line from the fuel pressure regulator to the vacuum tree, it must not contain any fuel. A broken diaphram in the FPR is common, but usually causes a rich condition.
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My name is Klaus and I am a V♂lv♂holic

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Fixed... I think... 850 1994

posted by RepairmanJackal on Thu Mar 14 18:06 CST 2013
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Okay, so I pulled the FI rail, cleaned the bejesus out of the injectors and seals, reseated those ring gaskets in the manifold, checked all the vacuum connections... re-assembled and then started the car for a bit.

Still running rough, but warmed it up okay. I shut it down and pulled codes.

This time I got a 1-1-3 (old) and then a 5-1-2 (new)... so too lean... too rich.

I cleared the codes, restarted the engine and did not get a CEL back on the dash. Warmed it up entirely, drove it around for a while (confirming the odometer is working) and the CEL stayed away.

I think I managed to fix that issue. On to the next problem.

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Most Likely Source of a Code 1-1-3? 850 1994

posted by RepairmanJackal on Sun Mar 10 06:49 CST 2013
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last visit: Tue Jun 10 09:52 CST 2014

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good places to check.

Vacuum tree rubber was good, but I'll re-check it. I put on an entirely new manifold gasket so it *should* be good, but I'll break out the mechanics sensor (garden hose) and listen for leaks.

Thanks for the tips

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