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View Full Version : 2.5 efi 260hp running rich


OBSESSION
04-29-2002, 12:53 PM
other than the a48 ecu, what could cause rich condition, hard start when cold or when hot, sluggish on take-off, i have a dvm for testing, what tests and readings can i do, thank you
captcarb
04-29-2002, 02:53 PM
Tell us what event led up to this situation.
OBSESSION
04-29-2002, 03:42 PM
i bought it like it is, have checked fuel psi,put in new spark plugs, had rapair check the ecu, and still has the problem, thank you
Firestarter
04-29-2002, 03:52 PM
Have the injectors cleaned and flowed
OBSESSION
04-29-2002, 04:03 PM
i dont under stand how having the injectors cleaned and flowed would cure a rich condition, who performs that service , thank you
Firestarter
04-29-2002, 04:06 PM
You can use Kinsler or RC engineering.
If the injector is dirty, the fuel will not atomize correctly and as such not burn fully, it will make for a lazy motor, having the screans pulled is a good idea. Even if this is not the problem , it is a good idea to do every season anyway.

RT
OBSESSION
04-29-2002, 04:12 PM
are you saying to have the screens removed and not put back in, is there anything electronically other than the ecu that can cause a rich condition, thank you
skydog
04-29-2002, 06:11 PM
Lots of times a drity injector can cause the pinto to sick open longer than it should letting more fuel in.
Skydog
us1
04-29-2002, 07:17 PM
Are all cyclinders running too rich or just one or two.
OBSESSION
04-29-2002, 07:48 PM
all are running rich
us1
04-29-2002, 08:13 PM
The injectors can make one or two cylinder run poorly when they are clogged but six cylinders are unlikely. Have you checked all the vacuum ports to make sure they are clear.
us1
04-29-2002, 08:17 PM
Steve had a problem just like yours a while back, he tried everything. It turned out to be a bad EFI wiring harness.
captcarb
04-29-2002, 08:31 PM
stroker had a rich running 260 a while back which turned out to be a bad temp sensor. The resistence of the sensor should be about 8000 ohms at 70-75 degrees. Higher is richer.

Jim
us1
04-29-2002, 09:31 PM
That is another possibility.
captcarb
04-29-2002, 09:39 PM
John,

Last year we were talking about a friend of yours that had twin mercs, both running extremely lean with boxes set at 115%. Did you ever resolve that one?

Jim
us1
04-29-2002, 09:56 PM
Yes, he sold the boat.:D But I never got enough time with the boat to really do a lot of testing. The boat was 200 miles from me.
captcarb
04-29-2002, 10:00 PM
maybe the new owner will discover S&F and you will get another chance?? Two more virtual motors!!

Jim
us1
04-29-2002, 10:41 PM
That would be my worst nightmare.:D