 Manifold Pressure Sensor MPS and timing, what is the effect on timing? |
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| thompson-mfr |
 Aug 29 2012, 02:08 PM
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Thompson, Ryan  Group: Members Posts: 198 Joined: 30-September 08 From: Silverton, OR Member No.: 9,598 Region Association: Pacific Northwest  |
Ok, I will try and keep this as brief as I can.
I will pose the question before providing the background. ?? What, if any, effect does the MPS have to do with actual timing of the motor?? Now for the reason for my question. 1974 2.0L FI My MPS (0 280 100 019 adjusted VW T4 unit) randomly stopped working properly even though electrically it checks out and holds vacuum. Maybe an aneroid cell? anyway not sure. I then started trouble shooting thinking it was points, plug wires, etc. ( I replaced to be sure) and readjusted the timing and dwel. Right after the MPS stopped working I found a good deal on another nice '74 2.0 FI 914. It has a factory MPS correct PN 0280 100 043 and runs perfectly. So, I thought I would swap MPS's and see if this fixed my problem. It didn't run well. Thoughts?? I have read Pbanders a bunch of times. I have included a picture of the new car in hopes there are others like me that like pictures. I only open threads with pictures as I cannot read good (well )just joking). Maybe other people can relate to this.  |
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| Bleyseng |
Aug 30 2012, 07:52 AM
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Aircooled Baby! Group: Members Posts: 13,036 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
If you plugged in a stock 043 MPS into a 74 2.0l FI setup and had to adjust it to run then something is wrong with you setup.
Now that you have adjust the MPS by drilling it out you have to use a wide band to get the A/F ratio correct or ship it to someone who has a Waveteck meter and can reset the 043 to spec. Then fix what ever is wrong with your FI. |
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| thompson-mfr |
Aug 30 2012, 08:49 AM
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#3
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Thompson, Ryan Group: Members Posts: 198 Joined: 30-September 08 From: Silverton, OR Member No.: 9,598 Region Association: Pacific Northwest |
QUOTE(Bleyseng @ Aug 30 2012, 06:52 AM)  If you plugged in a stock 043 MPS into a 74 2.0l FI setup and had to adjust it to run then something is wrong with you setup. Now that you have adjust the MPS by drilling it out you have to use a wide band to get the A/F ratio correct or ship it to someone who has a Waveteck meter and can reset the 043 to spec. Then fix what ever is wrong with your FI. I did not adjust the 043 MPS. I simply put a good one in my other car and it didn't run well. I only adjusted the 019 T4 VW MPS unit. I have it running "OK" with the 019 T4 VW MPS. I may get a A/F meter and dial it in more. I find it very strange the factory 043 MPS does not work well in my car????!!! |
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Posts in this topic
thompson-mfr Manifold Pressure Sensor MPS and timing Aug 29 2012, 02:08 PM
SLITS MPS has no effect on engine timing.
It only deter... Aug 29 2012, 02:12 PM ThinAir Since you were running a non-stock, adjusted, MPS ... Aug 29 2012, 02:21 PM
thompson-mfr
Since you were running a non-stock, adjusted, MPS... Aug 29 2012, 02:50 PM brant I hope your using a wideband o2 sensor to adjust t... Aug 29 2012, 02:58 PM thompson-mfr
I hope your using a wideband o2 sensor to adjust ... Aug 29 2012, 03:48 PM brant I'm sorry I was talking about a wideband 02 se... Aug 29 2012, 03:51 PM thompson-mfr
I'm sorry I was talking about a wideband 02 s... Aug 29 2012, 04:50 PM SLITS For $3 off the net from China, you can buy a ... Aug 29 2012, 04:15 PM thompson-mfr
For $3 off the net from China, you can buy a... Aug 29 2012, 04:57 PM SLITS
For $3 off the net from China, you can buy ... Aug 29 2012, 05:15 PM Dave_Darling
For $3 off the net from China, you can buy a... Aug 29 2012, 11:50 PM Krieger You can buy a cheap a/f meter from JEGS for ... Aug 29 2012, 07:01 PM SLITS
I find it very strange the factory 043 MPS does n... Aug 30 2012, 08:53 AM thompson-mfr
I find it very strange the factory 043 MPS does ... Aug 30 2012, 09:02 AM |
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