986 Forum - The Community for Porsche Boxster & Cayman Owners

986 Forum - The Community for Porsche Boxster & Cayman Owners (http://986forum.com/forums/)
-   Boxster General Discussions (http://986forum.com/forums/boxster-general-discussions/)
-   -   P 1128, 1130, 1115 1119 Help! (http://986forum.com/forums/boxster-general-discussions/59481-p-1128-1130-1115-1119-help.html)

diff operator 11-10-2015 06:47 AM

P 1128, 1130, 1115 1119 Help!
 
Ok,
As in the title I have a 2000 Boxster 2.7 and I'm getting the following codes:
P 1128, 1130, 1115 1119
The car seems to idle a little low. somewhere about 650-700 maybe, the car has a light vibration at idle, nothing major. When I drive the car is a little rough right on throttle tip in but the car revs fine and drives nicely.
I've searched and seen a variety of causes and solutions proposed.
I tried disconnecting the MAF and drove to see if I noticed a difference, witch I did not. however, I didn't clear the codes first so I'm not sure if I should have or not.
The car had previously sat for a while before I got it, is it possible there is a fuel pressure issue?
By the way, I tried removing the oil cap, there was a slight vacuum, but it was easy to remove, the idle did increase when I removed it.'
Any help would be appreciated

JFP in PA 11-10-2015 07:43 AM

P1115 and 1119 indicate a problem with the heaters on the O2 sensors ahead of the main cat on both banks. P1128 and 1130 indicate both banks are over rich. Most likely issue is a wiring problem that has taken out the heaters on the O2 sensors, so I would start there first.

diff operator 11-11-2015 12:20 PM

Interesting, I thought I had just read that it indicated that they were lean?

JFP in PA 11-11-2015 01:12 PM

Quote:

Originally Posted by diff operator (Post 473201)
Interesting, I thought I had just read that it indicated that they were lean?

This is a common problem with internet discussions of P1128 and 1130. On the early cars (up to 1999) which had the 5.2.2 DME, P1128 and 1130 were the codes for an overly lean condition. However, on the 2000-2001 cars with the 7.2 DME as well as the later 7.8 DME, the same two codes (P1128 and 1130) were for an over rich condition; exactly the opposite condition.

Again, this one of many examples of why I tell people that use out of date or incomplete bootlegged service manuals to always double check their information; unless you have the complete OBD II diagnostics manual for the 986 series, including the more than 100 supplements covering issues like the above, you could easily end up chasing your tail..............

diff operator 11-12-2015 12:59 PM

Would it make sense that both O2 sensors ahead of the cats went bad at the same time? The exhaust certainly doesn't look or smell rich. Would that cause the slightly low idle?
Does anyone have input on the MAF reset / testing the MAF?
Could it be an issue with the fuel pressure regulator?

JFP in PA 11-13-2015 11:57 AM

Quote:

Originally Posted by diff operator (Post 473384)
Would it make sense that both O2 sensors ahead of the cats went bad at the same time? The exhaust certainly doesn't look or smell rich. Would that cause the slightly low idle?
Does anyone have input on the MAF reset / testing the MAF?
Could it be an issue with the fuel pressure regulator?

Multiple O2 sensors very rarely fail at the same time, usually that is a wiring issue.


All times are GMT -8. The time now is 12:59 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website