Running Rich Rough Idle pls HELP

[2000StreetRod]

performance upgrades?

In my opinion, unless you make modifications to the engine that significantly upgrade your aifflow (ported heads with large valves, longer duration camshafts, forced induction) the stock fuel pump is adequate. I monitored and datalogged my air/fuel ratios during numerous WOT runs with a high flow intake system and the stock fuel pump. There was no problem maintaining the desired air/fuel ratio. I installed a 340 lph fuel pump for my supercharger installation. Most of the fuel just flows back into the tank via the intank fuel pressure regulator. It increases power consumption, the fuel temperature, and emissions. In your case with a fuel rail mounted fuel pressure regulator most of the fuel would be traveling the entire loop.

I also think the stock ignition coilpack is adequate up to the stock rpm limit of 6250. I have not increased my rev limit because with the stock internals the power drops rapidly above 6000 rpm. A note in my wiring diagrams states that the stock coil ouputs a voltage up to 40KV. I would not pay more for one that outputs only 35KV.

I am still using my original spark plug wires with no detected problems. I will probably replace them in the near future but haven't researched any at this point.

 

[glenn_a]

In my opinion, unless you make modifications to the engine that significantly upgrade your aifflow (ported heads with large valves, longer duration camshafts, forced induction) the stock fuel pump is adequate. I monitored and datalogged my air/fuel ratios during numerous WOT runs with a high flow intake system and the stock fuel pump. There was no problem maintaining the desired air/fuel ratio. I installed a 340 lph fuel pump for my supercharger installation. Most of the fuel just flows back into the tank via the intank fuel pressure regulator. It increases power consumption, the fuel temperature, and emissions. In your case with a fuel rail mounted fuel pressure regulator most of the fuel would be traveling the entire loop.

I also think the stock ignition coilpack is adequate up to the stock rpm limit of 6250. I have not increased my rev limit because with the stock internals the power drops rapidly above 6000 rpm. A note in my wiring diagrams states that the stock coil ouputs a voltage up to 40KV. I would not pay more for one that outputs only 35KV.

I am still using my original spark plug wires with no detected problems. I will probably replace them in the near future but haven't researched any at this point.

Sounds good to me...! Now I can rest my mind not to get all these parts lol...

 

[glenn_a]

Finally, got the print out from Ford....

just as I expected and what 2000StreetRod recommend that the Oxygen Sensor and Air Flow Meter need to be replace...

many thanks to 2000StreetRod and the other who helped me through all this but I cannot celebrate too early as I will need to replace it first and see how it goes...

 

[glenn_a]

got a new plugs again....

 

[glenn_a]

Got this too....

 

[ranger7ltr]

Has the ECT been measured for its resistance output not just temp?

I believe the SOHC has 2 ECT sensors; one for the temp gauge and one for the ECU fuel management... If you have a multimeter it might be worth your time to measure the resistance based on temperature and see what that sensor is outputting... You can find the test chart at this link...

http://oldfuelinjection.com/?p=28

Not trying to beat a dead horse here but the issues you are having with fuel richness really sound like the ECU ECT sensor gone away...And as long as the ECT sensor is outputting something you will not get a code for its signal...

Thanks heaps for all your help 2000StreetRod but the ECT has been checked and its working fine plus 02 sensor not showing any codes in my scanner and that made it harder for me to look around for faults...
I tried using our workshop Snap On scanner and the Auto Electrician Scanner and both dont show anymore faulty codes...

now trying to figure what make the car run rich and ill work on it manually and see how it goes...

 

[glenn_a]

I believe the SOHC has 2 ECT sensors; one for the temp gauge and one for the ECU fuel management... If you have a multimeter it might be worth your time to measure the resistance based on temperature and see what that sensor is outputting... You can find the test chart at this link...

http://oldfuelinjection.com/?p=28

Not trying to beat a dead horse here but the issues you are having with fuel richness really sound like the ECU ECT sensor gone away...And as long as the ECT sensor is outputting something you will not get a code for its signal...

thanks mate! I already checked all that and I found out it was the oxygen sensor was faulty..... which is very weird because it was a year old and no sign on dash/code showing...

 

[glenn_a]

Finally found the main problem....

yes its so weird no codes found or engine light showing on dash... I guess the generic scanner OBD cannot compare to genuine Ford Scanner....

Replaced! and its all good after all ................................!!!

 

[2000StreetRod]

congratulations!

I'm glad to learn that your problem is solved and thanks for posting the solution.

 

[glenn_a]

I'm glad to learn that your problem is solved and thanks for posting the solution.

Thanks to you too my friend.... and thanks from the fellow Explorers....

 

[glenn_a]

PROBLEM SOLVED...!





90...1,974

 

[LROB75]

Hi fellow Explorers, I need your help...

First couple of months ago I have this issues on and off problem that I can smell the car running rich and when ever I start the Explorer I cant just take off and drive because it kinda runs rough and it feels like its about to stall and when you accelerate it feels like its surging but eventually it will clear out and its good to go. this only happens on first time start if its sitting for a half a day...

2days ago I took the Engine off just to work on the Oil Sump, after all the job done the Explorer started fine like it should be but soon I drove it for half hour and starting to rough idle and puffing on the exhaust with a black smoke (kinda running rough and it surging soon you accelerate but on high revs it feels like it clears out but when it back to normal idle then it surge again)

Now Ive been reading forum to forums, people says it could be Air Flow Meter, PCM, Oxygen Sensor, EGR, Vacuum Leaks, Foul Plugs, Fuel pressure...

I have done the scanning and found my Air Flow Meter was faulty P1100 (MAF Sensor Intermittent) and noticed the P1000 (OBD11 System checks Incomplete) was there too.

Then first I replaced the Air Flow Meter and It cleared from the scanning but the P1000 still there and the Explorer still running same problem...

Second I replaced the PCM and it cleared the from scanning but then the problem still there...

I was thinking maybe the Injectors are playing up so I removed it and check for pattern spray which is still looking good, while I'm at it I checked for any vacuum hoses it maybe cracked or came off and if there's any gasket been damaged but no sign either...

Now I'm definitely stuck and don't know where to go now... I replaced the spark plugs again but still the same, leads and coil pack still good too...

................Please If there's anyone out there could help me out and maybe had same experiences please share what you done to solve this issue..............


[note] I have a SOHC V6 engine Ford Explorer XLT 1997....
Thank you!

Next purchase will be an electric car so I never have to deal with this BS ever again!