 My 1.7 FI is suddenly running rich.... |
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| lennyhope |
 Jul 5 2014, 01:06 PM
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#1
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Member  Group: Members Posts: 168 Joined: 2-November 11 From: prescot Member No.: 13,736 Region Association: England   |
My 1.7 FI is suddenly running rich. I have not changed anything i am aware of. I sometimes have a lose injector plug but that's it. Any suggestions where to start troubleshooting?
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| Bob L. |
Jul 5 2014, 01:40 PM
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#2
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Senior Member Group: Members Posts: 848 Joined: 7-August 11 From: Austin TX Member No.: 13,411 Region Association: Southwest Region |
I would check all the vacuum hoses. Next would be injectors, The seals and the injector itself. Don't forget the cold start injector.
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| mepstein |
Jul 5 2014, 01:44 PM
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#3
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914-6 GT in waiting Group: Members Posts: 19,620 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region 
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Mine ran very rich when I forgot to plug in the cold start injector. Drove ok but the exhaust was wet with gas
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| Java2570 |
Jul 5 2014, 01:53 PM
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#4
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Senior Member Group: Members Posts: 649 Joined: 7-May 11 From: Fishers, IN Member No.: 13,035 Region Association: Upper MidWest |
Take a look at this webpage: http://members.rennlist.com/pbanders/DJetParts.htm
You could have an MPS (Manifold Pressure Sensor) that has a leaky diaphragm, that would cause you to run very rich. Or an open CHT (Cylinder Head Temperature) sensor could cause a rich situation. The website linked has a lot of troubleshooting and parts information that could help diagnose this rich issue. |
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| lennyhope |
Jul 5 2014, 03:37 PM
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#5
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Member Group: Members Posts: 168 Joined: 2-November 11 From: prescot Member No.: 13,736 Region Association: England |
Doh! Where is the cold start injector??
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| Java2570 |
Jul 5 2014, 03:59 PM
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#6
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Senior Member Group: Members Posts: 649 Joined: 7-May 11 From: Fishers, IN Member No.: 13,035 Region Association: Upper MidWest |
Cold start injector is attached to the air plenum....see picture:
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| Cap'n Krusty |
Jul 5 2014, 05:10 PM
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#7
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
QUOTE(mepstein @ Jul 5 2014, 12:44 PM)  Mine ran very rich when I forgot to plug in the cold start injector. Drove ok but the exhaust was wet with gas The assumed connection stated here is impossible. As in, "can't happen". The Cap'n |
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| Cap'n Krusty |
Jul 5 2014, 05:12 PM
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#8
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
QUOTE(Java2570 @ Jul 5 2014, 12:53 PM) Take a look at this webpage: http://members.rennlist.com/pbanders/DJetParts.htm You could have an MPS (Manifold Pressure Sensor) that has a leaky diaphragm, that would cause you to run very rich. Or an open CHT (Cylinder Head Temperature) sensor could cause a rich situation. The website linked has a lot of troubleshooting and parts information that could help diagnose this rich issue. Won't start with an open CHT. I would persue the MPS and the hose connecting it to the intake plenum. The Cap'n |
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| lennyhope |
Jul 6 2014, 02:36 PM
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#9
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Member Group: Members Posts: 168 Joined: 2-November 11 From: prescot Member No.: 13,736 Region Association: England |
Thanks......ALL great info. I check the tightness of all th ehoses etc and it ran well. Took the car for a 6 mile trip and ran fine. Tick over a little low upon return though....
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