escort running rich

BilLster · 09-16-2003, 09:12 PM

we have a 88 escort wagon that started running really rich.

Pulled the o2 sensor black replaced it all 4 plugs supper carboned.

car still running rich after sensor plug change.

I'm thinking return line plugged or pressure to high as gas is now smelled as soon as the car starts before it askes the 02 sensor for reading's

so how do you test fuell pressure on a CFI unit ? should I be able to blow compressed air thru the return line ?

there are two adjustments screws under the back of the throttle body for the fuel line and return line and I've been told you can remove the top of the cfi unit and turn the inside to adjust fuel pressure ?but the person didnt know which way was down ?

someone else suggested a vacum leak but i couldnt find any.

thanks the top end screams but how often do we drive there.

mustangII460 · 09-17-2003, 03:23 PM

Had a map sensor go bad and do the same thing. I unplugged it and it smoothed out, replaced it and it fixed it.

BilLster · 09-17-2003, 04:25 PM

thanks pulled codes and got no crankshaft position sensor signal
and 02 sensor rich

will check the map

BilLster · 09-17-2003, 05:50 PM

found a leak in the vacum line going to the Map sensor. replaced the line car runs alot better but plugs are fould and so is the o2 sensor have to find a way to clean it.

the check engine light comes on but when i checked codes i got code 11 all ok ???

now to fix all the adjustments i made looking for the problem.

mustangII460 · 09-17-2003, 07:47 PM

Never use anything on the 02 sensor to clean it. I have used a torch to heat it cherry red. Don't member what temp those things run at, maybe 500 degrees? Anyway, getting it red (But don't melt it) should work.

Not sure what any codes mean. Got too many numbers to remember as it is.

09-16-2003, 09:12 PM	#1
BilLster Registered Member Join Date: Oct 2000 Location: Ontario canada Posts: 446	escort running rich we have a 88 escort wagon that started running really rich. Pulled the o2 sensor black replaced it all 4 plugs supper carboned. car still running rich after sensor plug change. I'm thinking return line plugged or pressure to high as gas is now smelled as soon as the car starts before it askes the 02 sensor for reading's so how do you test fuell pressure on a CFI unit ? should I be able to blow compressed air thru the return line ? there are two adjustments screws under the back of the throttle body for the fuel line and return line and I've been told you can remove the top of the cfi unit and turn the inside to adjust fuel pressure ?but the person didnt know which way was down ? someone else suggested a vacum leak but i couldnt find any. thanks the top end screams but how often do we drive there. __________________ 89 with 331 t3'/t4 hybrids. upr Suspention worked out finnaly . 9.89 144 mph .

09-17-2003, 04:25 PM	#3
BilLster Registered Member Join Date: Oct 2000 Location: Ontario canada Posts: 446	thanks pulled codes and got no crankshaft position sensor signal and 02 sensor rich will check the map __________________ 89 with 331 t3'/t4 hybrids. upr Suspention worked out finnaly . 9.89 144 mph .

09-17-2003, 05:50 PM	#4
BilLster Registered Member Join Date: Oct 2000 Location: Ontario canada Posts: 446	found a leak in the vacum line going to the Map sensor. replaced the line car runs alot better but plugs are fould and so is the o2 sensor have to find a way to clean it. the check engine light comes on but when i checked codes i got code 11 all ok ??? now to fix all the adjustments i made looking for the problem. __________________ 89 with 331 t3'/t4 hybrids. upr Suspention worked out finnaly . 9.89 144 mph .

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09-17-2003, 03:23 PM	#2
mustangII460 Factoy Five Roadster Join Date: May 2000 Location: Sevier Co,Tennessee Posts: 1,681	Had a map sensor go bad and do the same thing. I unplugged it and it smoothed out, replaced it and it fixed it.

09-17-2003, 07:47 PM	#5
mustangII460 Factoy Five Roadster Join Date: May 2000 Location: Sevier Co,Tennessee Posts: 1,681	Never use anything on the 02 sensor to clean it. I have used a torch to heat it cherry red. Don't member what temp those things run at, maybe 500 degrees? Anyway, getting it red (But don't melt it) should work. Not sure what any codes mean. Got too many numbers to remember as it is.