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| Bullet |
 May 31 2004, 12:23 PM
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#1
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Member  Group: Members Posts: 116 Joined: 16-April 04 From: Newberg, OR Member No.: 1,940  |
I can seem to get my 914 to not run Rich. I have checked Injector spray paterns, replaced cap,rotor, points, condensor,plugs, plug wires. and belive that my vacuum routing is correct. I question the integrety of the MPS. if i remove the vacuum hose that runs to it and clamp it off i get no change at all in performance. I was told by a co-worker that i should drill out the riviots and check to see if it is gummed up. I just removed it and am getting ready to take it apart, when out of curiousity I ohm checked the teminals and this is what i got : pin 8 - pin 10 350 ohms, pin 7 - pin 15 90 ohms. is this normal? does anyone know of any way to check the MPS. Or could any one do a quick ohm check on theese terminals to let me know if that is a correct reading? any help would be greatly apreciated.
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| pbanders |
Jun 16 2004, 04:18 PM
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#2
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Senior Member Group: Members Posts: 943 Joined: 11-June 03 From: Phoenix, AZ Member No.: 805 |
The basic injection pulse width at idle is still determined by the "load" as measured by the MPS. Corrections are made to the pulse width for engine temperature, air temperature, and also for the idle condition. Idle condition is sensed by the ECU from the TPS contact. When it is "on" the position of the idle mixture knob on the ECU affects the mixture. The basic correction is set by the speed control circuit in the ECU. In early ECU's, there was no knob - the speed control circuit set the idle mixture condition. In later ECU's, the knob permitted the basic correction to be made richer or leaner by turning the knob. Most ECU's have a small "nick" in the plastic surround of the idle mixture control knob. That "nick" corresponds to the position of the knob where the mixture is set only by the speed control - the "factory" setting. I've found that most cars require a setting no more than +/- 3 "clicks" from this position to have the CO set correctly.
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Posts in this topic
Bullet MPS May 31 2004, 12:23 PM
gklinger Pretty much everything you could want or need to k... May 31 2004, 12:34 PM Bullet Thanks for the link. I was just surfing around on... May 31 2004, 12:38 PM gklinger Bullet I read through his site and still come to the conc... May 31 2004, 01:26 PM mike_the_man First of all, pull a vacuum on the MPS. I bet th... May 31 2004, 01:29 PM Bullet Well it looks like i wil have to wait untill tomor... May 31 2004, 02:36 PM mike_the_man Not much you can test with the trigger points, as ... May 31 2004, 03:43 PM pbanders Rich running can have several causes. First thing ... May 31 2004, 04:06 PM pbanders If your car has over 100K miles and you don't ... May 31 2004, 04:07 PM Bullet ... May 31 2004, 06:01 PM pbanders Bullet QUOTE
tod914 Goes right behind the Heat level inbetween the 2 s... May 31 2004, 06:40 PM lmcchesney Brad has given you the method of checking the vacu... May 31 2004, 08:06 PM bob174 I saw some advice about adjusting the mixture with... May 31 2004, 08:35 PM Bullet tod914 That's it. That defrost cover has a baseplate... Jun 1 2004, 08:14 AM Bullet QUOTE
Bleyseng All MPS's are basically the same. Some are sho... Jun 1 2004, 07:55 PM 4WheelDrifter L McC, I didn't mean you listed the auction, j... Jun 1 2004, 11:02 PM lmcchesney My email was lighting up with questions. Jun 2 2004, 06:21 AM Bullet Well, I won the auction for the MPS. recived it i... Jun 10 2004, 11:00 PM dmenche914 there are different MPS for different years, and e... Jun 11 2004, 12:40 AM dmenche914 Valve adjustment ????, compression test???? Is the... Jun 11 2004, 12:47 AM Bullet It is a fresh rebuild. I adjusted the valves when... Jun 11 2004, 01:06 AM pbanders What does the vacuum gauge guide tell you about a ... Jun 11 2004, 09:43 AM nebreitling you have replaced the trigger points, no?
do it i... Jun 11 2004, 09:48 AM mike_the_man Have you tested all of the injectors to make sure ... Jun 11 2004, 10:18 AM Bullet What i came up with, Even though Injector #3 does... Jun 11 2004, 08:52 PM lmcchesney You are getting there Bullet. Just a little more.... Jun 12 2004, 12:44 PM Bullet Im about to give up on this car. It has to have a... Jun 13 2004, 06:18 PM Bullet I jsut went out side and fired it, Noticed that wh... Jun 13 2004, 06:50 PM Bullet I was reading through some stuff on pbanders site ... Jun 13 2004, 08:44 PM Bleyseng It goes to the plenum via a rubber boot that has a... Jun 13 2004, 10:21 PM Bullet I also just discoverd that if i remove the Yellow ... Jun 13 2004, 10:35 PM RustyWa Bullet mine is a 75 2.0L. So you are saying that it goes... Jun 13 2004, 11:43 PM Bleyseng Air cleaner then if you have a 75 with all the smo... Jun 14 2004, 08:18 AM RustyWa ... Jun 14 2004, 08:20 AM RustyWa I need a reminder. The MPS has no effect on the I... Jun 16 2004, 01:07 PM Jeff Bonanno a quote from pbanders site (MPS page):
"The LVT, ... Jun 16 2004, 01:43 PM Bullet So is that a yes or a No? does the MPS have an ef... Jun 16 2004, 06:58 PM Bleyseng Only a leaky MPS has an effect on the idle as it s... Jun 16 2004, 08:09 PM Bullet I dont think that the cam would have much of an ef... Jun 16 2004, 08:21 PM Bleyseng There is no way to accurately set the A/F without ... Jun 16 2004, 10:13 PM Bullet I have access to a 5-gas machine at work that i wa... Jun 17 2004, 12:24 AM Bullet today a bummed a known good MPS that a co-worker h... Jun 17 2004, 08:36 PM
lmcchesney Glad to hear you isolated the problem to the MPS.
... Jun 18 2004, 06:22 AM |
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