 Strange MPS issue, Lew's car |
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| 914itis |
 Apr 15 2014, 04:22 PM
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#1
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Advanced Member  Group: Members Posts: 2,892 Joined: 9-October 10 From: New York City Member No.: 12,256 Region Association: North East States  |
I am helping Brian with Lew's car. As most of you may know, it is a 2056 with djet.
The car was running fine, he drive it to CT one day and when he came back he noticed that the MPS was hanging. The car starts to run on 3 cylinders with #4 not firing. We checked for spark and injectors they are all fine, but if you remove spark wire #4, it had no effect. The strange thing is if you elevate the mps about 6 inches up, it's all fine, even that 4th cyl works. All the electrical wires on the unit are fine (IMG:style_emoticons/default/confused24.gif) ? Dies the 2056 uses 1.7 or 2.0 MPS? He would like to make it to Hershey. |
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Replies
| JeffBowlsby |
Apr 15 2014, 05:01 PM
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#2
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914 Wiring Harnesses Group: Members Posts: 8,706 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None 
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a 2.0L MPS is necessary for the 2056 recalibration. The 1.7L MPS does not have enough room to adjust.
If #4 is intermittent it has nothing to do with the MPS. Check either the rest of the harness for wiring issues or perhaps the FI grounds at the top rear of the case. |
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Posts in this topic
914itis Strange MPS issue Apr 15 2014, 04:22 PM
r_towle If he lifts up the MPS it runs fine?
Is there oil ... Apr 15 2014, 04:47 PM
Mblizzard
a 2.0L MPS is necessary for the 2056 recalibratio... Apr 15 2014, 07:31 PM 914itis I wouldn't say intermittent, it only runs righ... Apr 15 2014, 07:12 PM achman_73_2.0
I wouldn't say intermittent, it only runs rig... Apr 15 2014, 08:54 PM achman_73_2.0
I wouldn't say intermittent, it only runs ri... Apr 15 2014, 08:57 PM 914_teener I have always thought the two MPS bodies of the 1.... Apr 15 2014, 09:25 PM 914itis
I have always thought the two MPS bodies of the 1... Apr 15 2014, 09:40 PM r_towle
I have always thought the two MPS bodies of the ... Apr 28 2014, 10:25 AM achman_73_2.0
[quote name='914itis' post='2025345' date='Apr 15... Apr 28 2014, 02:41 PM 914itis
[quote name='914itis' post='2025345' date='Apr 1... Apr 28 2014, 02:52 PM 76-914 EMF. It's sensitive to spark plug wires. Rerou... Apr 15 2014, 09:33 PM Jeff Bowlsby Those exposed wires in the harness concern me. Br... Apr 15 2014, 10:03 PM Bleyseng
Those exposed wires in the harness concern me. B... Apr 16 2014, 04:01 AM Dave_Darling One curious thing that I found--the MPS can be sen... Apr 16 2014, 08:35 AM achman_73_2.0
One curious thing that I found--the MPS can be se... Apr 16 2014, 10:07 AM Dave_Darling
This all started when I came home from a drive to... Apr 16 2014, 05:08 PM 914itis
This all started when I came home from a drive t... Apr 16 2014, 05:32 PM achman_73_2.0
[quote name='Dave_Darling' post='2025699' date='A... Apr 16 2014, 08:08 PM worn
Pretty bummed, but looks like I may be taking t... Apr 28 2014, 12:06 PM SLITS You need a vacuum pump and volt/ohm meter ........... Apr 16 2014, 11:17 AM 914_teener I would talk to Jeff Bowlsby....
Try and have him... Apr 16 2014, 09:26 PM 914_teener Did you test it as Slit's suggested? Apr 16 2014, 09:31 PM r_towle You are not looking for water in the plenum, you a... Apr 16 2014, 09:48 PM achman_73_2.0 FIXED!
So I was finally able to go to the gar... Apr 28 2014, 07:23 AM r_towle
FIXED!
So I was finally able to go to the ga... Apr 28 2014, 08:23 AM 914itis I read your email late last night. That's grea... Apr 28 2014, 07:28 AM Big Len Glad to hear it !! Apr 28 2014, 07:39 AM Mblizzard Also make sure you are connecting the vacuum corre... Apr 28 2014, 10:18 AM worn
Also make sure you are connecting the vacuum corr... Apr 28 2014, 08:51 PM achman_73_2.0
Also make sure you are connecting the vacuum cor... Apr 29 2014, 09:18 AM 914_teener "I did a lot of inductance graphing and I sus... Apr 28 2014, 02:13 PM 76-914 set your valves 1st, then time it. good job! ... Apr 28 2014, 03:14 PM r_towle Mps has no impact on pinging or detonation. Apr 28 2014, 06:10 PM The Cabinetmaker "Either the wiring of the #4 injector to the ... Apr 28 2014, 06:58 PM achman_73_2.0
"Either the wiring of the #4 injector to the... Apr 29 2014, 09:16 AM worn
"Either the wiring of the #4 injector to th... Apr 29 2014, 09:49 AM achman_73_2.0
[quote name='achman_73_2.0' post='2030859' date='... Apr 29 2014, 02:32 PM 914_teener When I read the post and suggestions......there ar... Apr 29 2014, 09:41 AM achman_73_2.0
When I read the post and suggestions......there a... Apr 29 2014, 02:33 PM 914_teener
When I read the post and suggestions......there ... Apr 29 2014, 03:02 PM achman_73_2.0
[quote name='achman_73_2.0' post='2030977' date='... Apr 30 2014, 11:18 AM Dave_Darling The MPS can affect detonation. An overly-lean mix... Apr 29 2014, 12:48 PM achman_73_2.0
The MPS can affect detonation. An overly-lean mi... Apr 29 2014, 02:35 PM r_towle Detonation, or pre-ignition, is typically cause by... Apr 29 2014, 06:02 PM The Cabinetmaker You've had several very knowledgeable people t... Apr 29 2014, 06:15 PM achman_73_2.0
You've had several very knowledgeable people ... Apr 30 2014, 11:22 AM worn
You've had several very knowledgeable people... Apr 30 2014, 11:35 AM achman_73_2.0
[quote name='achman_73_2.0' post='2031371' date='... Apr 30 2014, 05:12 PM |
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