Go Back   986 Forum - The Community for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Performance and Technical Chat

Post Reply
 
LinkBack Thread Tools Display Modes
Old 06-17-2021, 02:38 PM   #1
Registered User
 
Join Date: Sep 2018
Location: Illinois
Posts: 190
Garage
DME incommunicado

After an engine swap (old one had no oil and trashed tensioners) I get it started, but it runs poorly and quits.
I have codes 0650 and 9110.
I had it at a shop where they say the DME is dead. The tech who flashed the 996 tune says that's unlikely.
So I'm posting here in hopes someone has had this situation and can provide guidance.
The shop did check the wiring and said it's ok.
I've got it scheduled for a specialist shop next week but it's 250 miles away and I would certainly like to avoid a tow like that!

__________________
A cynic is a man who, when he smells flowers, looks around for a coffin.
-H. L. Mencken
Newsguy is offline   Reply With Quote
Old 06-17-2021, 04:54 PM   #2
Motorist & Coffee Drinker
 
78F350's Avatar
 
Join Date: Jul 2014
Location: Oklahoma
Posts: 3,653
Garage
I don't know if it would help (in time), but I could send a 7.2 DME, key fob, and M535 box if you want to check it by swapping out the set. I forget what year car you have. Buy it or borrow it....

I've been surprised how often grounds are overlooked. There is a grounding point to the right of the DME mount (if you are facing forward) and the main engine ground from the lower starter bolt to the SAI blower bracket.
__________________
I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.

Last edited by 78F350; 06-17-2021 at 04:57 PM.
78F350 is offline   Reply With Quote
Old 06-17-2021, 06:18 PM   #3
inveniam viam aut faciam
 
Join Date: Mar 2014
Location: Arvada, CO
Posts: 440
These DMEs VERY rarely fail. What is this shop using to get the fault codes?
__________________
'03 S, manual, 18" Carrera wheels, PSM, PSE, Litronic, 996 Cluster, +
Qmulus is offline   Reply With Quote
Old 06-17-2021, 06:25 PM   #4
Registered User
 
Join Date: May 2017
Posts: 1,182
You got the engine running, safe to eliminate the DME for the moment.

From the symptoms, it sounds like you have a vacuum leak and/or everything isn't hooked up correctly or not connected. Happens to the best of us when replacing or dropping an engine. Go over every connector/sensor, vacuum line, etc.
__________________
2000 Boxster Tiptronic
2003 Boxster
2003 996 C2 Cab
2002 996 (SOLD)
1986 944 (gone but missed)
Stl-986 is offline   Reply With Quote
Old 06-17-2021, 06:27 PM   #5
Registered User
 
Join Date: May 2017
Posts: 1,182
For your P0650 code: https://www.renntech.org/topic/25355-cel-code-p0650/
__________________
2000 Boxster Tiptronic
2003 Boxster
2003 996 C2 Cab
2002 996 (SOLD)
1986 944 (gone but missed)
Stl-986 is offline   Reply With Quote
Old 06-17-2021, 09:17 PM   #6
Registered User
 
Join Date: Sep 2018
Location: Illinois
Posts: 190
Garage
78F350: may take you up on that!

Q-man; checked on Durametric here, and not sure what the shop used but they got the same codes.

Grounds are good.
Don't get indications of vacuum leaks, but haven't smoked it.

Thanks!
__________________
A cynic is a man who, when he smells flowers, looks around for a coffin.
-H. L. Mencken
Newsguy is offline   Reply With Quote
Old 06-18-2021, 05:47 AM   #7
Registered User
 
Join Date: Aug 2018
Location: Woodland Wa
Posts: 1,291
Quote:
Originally Posted by Newsguy View Post
After an engine swap (old one had no oil and trashed tensioners) I get it started, but it runs poorly and quits.
I have codes 0650 and 9110.
I had it at a shop where they say the DME is dead. The tech who flashed the 996 tune says that's unlikely.
So I'm posting here in hopes someone has had this situation and can provide guidance.
The shop did check the wiring and said it's ok.
I've got it scheduled for a specialist shop next week but it's 250 miles away and I would certainly like to avoid a tow like that!
What year is the car?
Car year can be important when it comes to P-codes.

Any and all mods?=== important info for diagnostics!!!

If your P0650 is for the check engine light, then that is most commonly a wiring issue, bad ground, or a burned out bulb.
Your P9110 is that possibly a mis-type on your part?
I find no P9110 code info.

Last edited by blue62; 06-18-2021 at 05:51 AM.
blue62 is offline   Reply With Quote
Old 06-18-2021, 04:41 PM   #8
Registered User
 
Join Date: Sep 2018
Location: Illinois
Posts: 190
Garage
Quote:
Originally Posted by blue62 View Post
What year is the car?
Car year can be important when it comes to P-codes.

Any and all mods?=== important info for diagnostics!!!

If your P0650 is for the check engine light, then that is most commonly a wiring issue, bad ground, or a burned out bulb.
Your P9110 is that possibly a mis-type on your part?
I find no P9110 code info.
99, 74mm TB with 996 ROW tune.
Continuity good to bulb, and good bulb.
9110 is a Porsche code.
__________________
A cynic is a man who, when he smells flowers, looks around for a coffin.
-H. L. Mencken
Newsguy is offline   Reply With Quote
Old 06-18-2021, 05:26 PM   #9
Registered User
 
Join Date: Aug 2018
Location: Woodland Wa
Posts: 1,291
Quote:
Originally Posted by Newsguy View Post
99, 74mm TB with 996 ROW tune.
Continuity good to bulb, and good bulb.
9110 is a Porsche code.
Do you know what the 9110 code is for?

So the Check engine light.
Does the light stay on all the time?
Or Does it not come on for a few seconds when first turning key to the on position?

Last edited by blue62; 06-18-2021 at 05:42 PM.
blue62 is offline   Reply With Quote
Old 06-20-2021, 05:37 AM   #10
Registered User
 
Join Date: May 2017
Posts: 1,182
I couldn't find anything in the FSM with that code. JFP may chime in or you can send him a PM, he may know
__________________
2000 Boxster Tiptronic
2003 Boxster
2003 996 C2 Cab
2002 996 (SOLD)
1986 944 (gone but missed)
Stl-986 is offline   Reply With Quote
Old 06-20-2021, 06:07 AM   #11
Registered User
 
Join Date: Aug 2018
Location: Woodland Wa
Posts: 1,291
Quote:
Originally Posted by Stl-986 View Post
I couldn't find anything in the FSM with that code. JFP may chime in or you can send him a PM, he may know
I couldn't find anything either.
I suspect it may be a dash pod circuit code.
But I have no way to confirm that.
blue62 is offline   Reply With Quote
Old 06-20-2021, 08:03 AM   #12
Registered User
 
Join Date: Sep 2018
Location: Illinois
Posts: 190
Garage
Quote:
Originally Posted by Stl-986 View Post
I couldn't find anything in the FSM with that code. JFP may chime in or you can send him a PM, he may know
I've been all through this for a month. 9110 is a problem with the DME, whether bad or just the connection.
I've communicated with JFP on this and it's now going to a Porsche shop.

I was just posting to see if anyone else had a similar problem and how they resolved it.

Thanks, though.
__________________
A cynic is a man who, when he smells flowers, looks around for a coffin.
-H. L. Mencken
Newsguy is offline   Reply With Quote
Old 06-20-2021, 08:26 AM   #13
Registered User
 
Join Date: Aug 2018
Location: Woodland Wa
Posts: 1,291
Quote:
Originally Posted by Newsguy View Post
I've been all through this for a month. 9110 is a problem with the DME, whether bad or just the connection.
I've communicated with JFP on this and it's now going to a Porsche shop.

I was just posting to see if anyone else had a similar problem and how they resolved it.

Thanks, though.
Thanks for the feedback on that code.
So in my brain the 9110 DME issue could be causing the 0650 code for the CEL light.
But that is just speculation.

The very few ECU issues I have come across have been bad grounds.
All on other makes of cars none on a Porsche.
Have not come across one that just decided to fail out of the blue.

Or things like a friend chipping his Ford truck that wiped the ECU clean.
He had to tow the truck to the dealer to get the ECU re flashed.

I am interested in what your final outcome is.
Please keep us posted.
blue62 is offline   Reply With Quote
Old 06-21-2021, 05:43 PM   #14
Registered User
 
Join Date: Oct 2020
Location: KY
Posts: 1,216
Late to the party but I have a question - why did you do a 996 tune? The 996 maps rely on a 3.25" MAF housing. If this was not done during your TB upsizing, that is likely the source of your ignition/idle issues. Going out in a limb here but the dme may be throwing a code on itself saying that it can't compute the situation. That's total speculation though, but I don't see a coincidence that the "dme fried" code is coming up after a flash.

Sent from my POCOPHONE F1 using Tapatalk
__________________
2000 Box Base, Renegade Stage 1 performance mods complete, more to come
When the owners manual says that the laws of physics can't be broken by this car, I took it as a challenge...
ike84 is offline   Reply With Quote
Old 06-21-2021, 08:10 PM   #15
Registered User
 
Join Date: Sep 2018
Location: Illinois
Posts: 190
Garage
74mm TB, 997 plenum, 987 airbox.
__________________
A cynic is a man who, when he smells flowers, looks around for a coffin.
-H. L. Mencken
Newsguy is offline   Reply With Quote
Old 06-21-2021, 09:03 PM   #16
Registered User
 
Join Date: Oct 2020
Location: KY
Posts: 1,216
Gotcha. That airbox does have the larger maf housing. Sorry if I missed it earlier.
The only other thing that I can think of is if the me versions are wrong - for example, flashing a post 2002 996 tune to a pre 2002 dme or vice versa (I'm pretty sure off the top of my head that's when they switched to 7.8). What year is your car and the donor motor? I'm sure you matched all that up before the swap, but maybe your tuner didn't know that detail?

One other thought - it may be worth asking the guy who did your flash if he flashed the entire dme or just the engine maps. If he flashed the entire dme, you may want to try to revert to your original dme and then flash ONLY the 996 maps. That leaves all the other programming in place (I. E. Instrument cluster, HVAC, etc).

Sent from my POCOPHONE F1 using Tapatalk

__________________
2000 Box Base, Renegade Stage 1 performance mods complete, more to come
When the owners manual says that the laws of physics can't be broken by this car, I took it as a challenge...
ike84 is offline   Reply With Quote
Post Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 12:09 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 -    DMCA Registered Agent Contact Page