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I have a 1990 motorhome E-350 ford 460 fuel injected. In ...

Sent to Car Experts March 19, 2006 11:31 a.m.

I have a 1990 motorhome E-350 ford 460 fuel injected. In the middle of a trip it began run rich, it would stall at idle. it would run at high speed but produce black smoke. Now if it starts in runs ruff and stalls. Thinking a fuel injector problem, but it's not just one all the spark plugs fouled. I also have some gas in the oil. Thinking one or more of the senesors rather than pulling all the injectors????

Optional Information:
1990 Ford E-350 460

Already Tried:
Nothing

Customer (name blocked for privacy)

Status: Closed Value: $15

Answer
March 19, 2006 11:46 a.m. (15 minutes and 22 seconds later)

ACCEPTED

You need to check the fuel pressure regulator .

Those are classic symptoms of a bad fuel pressure regulator.

Pull the vacuum line off the regulator after it has just been running if the inside of the hose is wet change the regulator.

Check to make sure the regulators diaphragm holds vacuum.

Edited by enginboy on March 19 2006 at 11:47am

Marc -- Technician,Auto -- 98% Positive Feedback on 1027 Car Accepts
32 years exp. automotive repair NYS emisisions repair cert.

Reply
Sent April 04, 2006 6:39 p.m. (16 days and 6 hours later)

Relist: I still need help.
Checked the fuel pressure regulator, it holds vacumn. check engine light never came on (thuoght that might help) Any other ideas???

Customer (name blocked for privacy)

Info Request
April 04, 2006 7:50 p.m. (1 hour and 11 minutes later)

REPLIED to Info Request

Are you saying that the check engine light does not even come on when you start the engine??

Marc -- Technician,Auto -- 98% Positive Feedback on 1027 Car Accepts
32 years exp. automotive repair NYS emisisions repair cert.

Reply to Marc
Sent April 05, 2006 6:32 p.m. (22 hours and 41 minutes later)

The engine light comes on when started but does notstay on so I figure it won't show any defect codes????? Thanks

Customer (name blocked for privacy)

Answer
April 05, 2006 6:51 p.m. (19 minutes and 39 seconds later)

ACCEPTED

It may be a sticking fuel pressure regulator or a restricted return line. (just thought about it) You need to run a fuel pressure test as described below.

All EFI and SEFI equipped vehicles should be 30-35 PSI at idle and 40-45 PSI with the vacuum line removed from the regulator. Disconnect the return line at the engine fuel rail and run a hose from the return fitting on the rail into a gas can. If the pressure is still high, replace the regulator. If not, check the return line for a restriction. Clean or replace the return line as necessary.

Edited by enginboy on April 5 2006 at 6:53pm

Marc -- Technician,Auto -- 98% Positive Feedback on 1027 Car Accepts
32 years exp. automotive repair NYS emisisions repair cert.

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