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Rough idle, poor gas mileage, running out of things to try. Check my list 200

posted by  pittroj on  Thu Jun 18 14:44 CST 2009
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last visit: Mon Oct 20 07:18 CST 2014
[RELATED]

I still have a rough idle on my NA 244 after trying all of the following things. I have tried many, many different things, such as:

1. Plugs, cap, rotor
2. Clean throttle body, flame trap, and ICM, AMM.
3.Replaced DOA intank pump, broken motormounts, bad overdrive solenoid.
4. Ran lucas oils fuel system cleaner and Techron through it since I have had it
5. Timing belt, all front seals
6.New o2 sensor
7.New air filter.
8. Clean injector grounds
9. Replace temp sensor
10. Replace FPR with a known good one
11. check for vacuum leaks.
12. Dielectric grease on all connections, injectors, AMM idle motor, inj. grounds, temp sensor etc.
13. New pre-pump
and some more things I am forgetting. I will probably pull the injectors and see how they look.

Fault codes are 1-1-1 which means no faults according to Bentley for my 1991 244 w/ LH. I have 3.0 OHMS across terminals 2 and 3 of the AMM, which according to Bentley is in spec range Specs are 2.5-4.0 OHMS. They say to replace the AMM if it is out of this range.

I believe I have a rich condition, tailpipe is black, and my brother's 89 244 is getting WAY better mileage, but his is a manual transmission.

I may do a compression check, and possibly seafoam it. I have spent so many hours on this, now I have hyper extended my knee from leaning on the bumper so much with my leg, it has been sore for three weeks.






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