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Ronk |
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Newbie ![]() Group: Members Posts: 1 Joined: 1-December 22 From: Connecticut Member No.: 27,001 Region Association: None ![]() |
Forum;
First post here. Electronically qualified, engaged vintage Volvo enthusiast and operator of the SW-EM site. As you may be aware, several Volvo models starting with the 1800 in '69 also had the D-Jet fitted, and I am revisiting it's installation/operation on my 1800ES as part of a recommissioning. I have procured a Manifold Pressure Sensor Rebuild kit from Tangerine Racing near me in Connecticut and plan to rework a spare unit I have (which fails a vac leakdown test, so diaphragm is likely fatigued and holed as is typical). As an electronics specialist, my plan is to understand the function of the MPS in conjunction with the ECU in detail so that the post rebuilding functional tests can reestablish it is operating as it did when new, including calibration, and before this major work. I have read Mr. Anders' write-up on his site but have further questions. I have been in contact with Mr. Anders before, when investigating the "Miss at Cruise" issue familiar to many D-Jet vehicle operators, and I need to once again talk electronic nitty-gritty with him about the MPS. I have tried the email I have for him (no response yet), as well as the telephone number (disco/non-functioning). If anyone has good current contact info, or can pass the word on and him to contact me, either through this forum or my e-mail, which he might still have, I thank those individuals in advance. I am also aware of Dr D-Jet's site. Cheers from the vintage Volvo world. Ronk |
Cairo94507 |
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Michael ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 10,302 Joined: 1-November 08 From: Auburn, CA Member No.: 9,712 Region Association: Northern California ![]() ![]() |
Ronk - Welcome to 914World; I have always loved the early Volvos. (IMG:style_emoticons/default/beerchug.gif)
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brant |
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914 Wizard ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 11,945 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains ![]() ![]() ![]() |
Welcome Ronk
I will just add one thing The fuel has changed so much over 30-40 years I’ve rebuilt about a half dozen MPS now If you set an MPS to factory settings…. Those settings were established for a different blend of gasoline that is no longer available So those settings create a lean situation to todays fuel blend The only way to get a corrected setting to todays fuel (IMHumble opinion) Is to use a wide band O2 gauge for AFR And tune the MPS for the motor and fuel rather than factory settings This is probably more important for air cooled motors that require the fuel charge to help cool the motor But could still be causal to the hiccup you experience Brant |
JeffBowlsby |
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914 Wiring Harnesses & Beekeeper ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 8,898 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None ![]() ![]() |
While we have not seen Brad A around here much in the last several years he does leave his website up and its a goldmine of the info you seek. A lot of theory and specifics to 914s, so not much specific help to the Volvo platform but good broad D-Jet info. Study every word of this site.
Dr Djet as well - tremendous resource. Study every word of this site also. I have several pieces of D-Jet test equipment and can rebuild and recalibrate your MPS [u]IF[\u] you can send me a known good unit to copy its calibration settings. I only recalibrate an MPS if I build it. See my website link to my 914 harnesses below in my signature block for more info. |
emerygt350 |
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Advanced Member ![]() ![]() ![]() ![]() Group: Members Posts: 2,848 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States ![]() |
vacuum gauge and an afr + the tangerine kit is really the best way in my opinion (besides having Jeff do it I guess).
I would say tuning it yourself is still maybe best since you do really need to know how it is performing in your car with all its little potential differences, particularly if you rebuild the motor. |
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