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914World.com _ 914World Garage _ My 1.7 FI is suddenly running rich....
Posted by: lennyhope Jul 5 2014, 01:06 PM
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?
Posted by: Bob L. Jul 5 2014, 01:40 PM
I would check all the vacuum hoses. Next would be injectors, The seals and the injector itself. Don't forget the cold start injector.
Posted by: mepstein Jul 5 2014, 01:44 PM
Mine ran very rich when I forgot to plug in the cold start injector. Drove ok but the exhaust was wet with gas
Posted by: Java2570 Jul 5 2014, 01:53 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.
Posted by: lennyhope Jul 5 2014, 03:37 PM
Doh! Where is the cold start injector??
Posted by: Java2570 Jul 5 2014, 03:59 PM
Cold start injector is attached to the air plenum....see picture: 
Posted by: Cap'n Krusty Jul 5 2014, 05:10 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
Posted by: Cap'n Krusty Jul 5 2014, 05:12 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
Posted by: lennyhope Jul 6 2014, 02:36 PM
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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