 MPS connection, Orientation of connector |
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| roygar |
 Oct 22 2012, 01:42 PM
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#1
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Newbie  Group: Members Posts: 9 Joined: 27-March 11 From: Manhattan, Kansas Member No.: 12,866 Region Association: Upper MidWest  |
I have the engine back in the car and I've connected all the wiring, fuel lines and vacuum hoses. The engine turns over but sputters and won't start. I have spark, fuel, but have not checked the fuel line pressure. One thing I noticed when connecting my wiring harness, the injector plugs and the MPS plug have chamfers for, I assume, one way fit. But mine will just as easily plug in either way. Can someone direct me to a photo, detail, or description of the right orientation?
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Replies(1 - 11)
| TheCabinetmaker |
Oct 22 2012, 01:57 PM
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#2
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I drive my car everyday Group: Members Posts: 8,336 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
Injector plugs can go either way. I think its the same for the mps. The fuel lines can get crossed and cause a no start condition.
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| 76-914 |
Oct 22 2012, 04:09 PM
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#3
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,700 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California 
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did you connect your cht? yes, the injectors don't care. as for the mps; I'd have to check it, can't remember.
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| pilothyer |
Oct 22 2012, 04:18 PM
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#4
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Member Group: Members Posts: 838 Joined: 21-May 08 From: N. Alabama Member No.: 9,080 Region Association: South East States |
I am pretty sure it does matter which way the MPS connector is connected. The MPS when viewed from the top has the connector numbered from left to right 7, 8, 10, 15...........The harness connector should be inserted with the bevels down which should orient pin # 7 on the left.
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| cary |
Oct 22 2012, 04:39 PM
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#5
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Advanced Member Group: Members Posts: 3,900 Joined: 26-January 04 From: Sherwood Oregon Member No.: 1,608 Region Association: Pacific Northwest
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Ditto on Jerry's comment.
I have the #7 marked on the white plug. I can see the #7 embossed in the MPS. |
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| JeffBowlsby |
Oct 22 2012, 06:52 PM
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#6
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914 Wiring Harnesses & Beekeeper Group: Members Posts: 8,909 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None
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It makes no difference, it is not a polarized connection. As long as it's firmly seated it's fine.
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| rick 918-S |
Oct 22 2012, 10:44 PM
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#7
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Hey nice rack! -Celette Group: Members Posts: 20,952 Joined: 30-December 02 From: Now in Superior WI Member No.: 43 Region Association: Northstar Region 
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Check to see you have the fuel flow in the correct direction. If the regulator is on the wrong side of the fuel flow it may fire but no run at all.
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| roygar |
Oct 23 2012, 07:32 AM
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#8
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Newbie Group: Members Posts: 9 Joined: 27-March 11 From: Manhattan, Kansas Member No.: 12,866 Region Association: Upper MidWest |
Thanks, Jeff, and everyone. CHT is connected, but I'll check the wire to see if it might have a break. I'll check all connections to be tight. Fuel flows from pump to passenger rail as shown in Dave Darlings 2.0 diagram. I'll try again tonight with some starting fluid. My throttle cable is not connected yet. At what position should I hold the throttle for starting? Wide open, half open, or closed?
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| thompson-mfr |
Oct 23 2012, 04:44 PM
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#9
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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 |
You shouldn't need to hold the throttle open at all. That is one of the creature comforts of FI.
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| cary |
Oct 23 2012, 05:14 PM
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#10
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Advanced Member Group: Members Posts: 3,900 Joined: 26-January 04 From: Sherwood Oregon Member No.: 1,608 Region Association: Pacific Northwest
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Trigger point connector on the distributor ?
Then the most important connections. The grounds for the FI harness under the throttle body. |
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| roygar |
Oct 23 2012, 10:26 PM
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#11
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Newbie Group: Members Posts: 9 Joined: 27-March 11 From: Manhattan, Kansas Member No.: 12,866 Region Association: Upper MidWest |
I sprayed some starter fluid in the throttle valve, cranked it and it ran for 20 sec. Then backfired out the top. Did the same thing, 3 times. Inside the throttle valve it was wet with fuel. Appears to have a bad timing issue. I adjusted the valves, but I didnt move the distrbutor when the engine was out. What else? What is the trigger point connector?
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| 76-914 |
Oct 25 2012, 10:42 AM
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#12
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,700 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California
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I don't think you have an issue w/ trigger points or anything else electrical. If it starts and ran after spraying starting fluid I would look at a fuel delivery problem. Crossed return/pressure line; crap in tank or clogged fuel sock or fuel filter; fuel pump -what pressure are you seeing and is the pump running? Do you have the flow chart to check your fuel pump circuit?
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