Hey all, I need help bad. I was told by the dealer it would be over 150 to scan and do a fuel trim on my 02 Explorer, XLT, 4.0, Auto. I can't afford the scan or a garage. I paid 4200 for it and a short time later it starts surging at stop lights then it starts sputtering when idling and taking a while to start. Next it stops accelorating past 2.5k, then works well a bit then stops accelorating past 50 miles an hour. Then it works with an 02 disconnected then starts acting up again. It now either runs normal, wont accelorate past certain ranges, or starts then quits 3 seconds later, unless I unplug the MAF then it runs 15 seconds then stalls. Through all this symptoms come and go. Always banks 1 and 2 lean.

Symptoms
Knock
Rough Idle
Slow Starts
Hesitation
Lag
Stall

Replaced
02 Sensors
Fuel Filter
Injectors
Plugs
Plug Wires

Tested
Maf
TP
Temp Sensor
Cam Sensor
Crank Sensor
All EGR Components
Idle Valve
Coil Pack
For any air leaks.
Fuel pressure 37 or higher
Clean Fuel Pump Strainer
Flow tested pump
Checked air filter

 

Go to Autozone or similar parts store and get codes.
Post the codes here.

 

With all the replacement parts listed, a $150 scan cost would have been a deal..

For that matter you could have purchased your very own Autel ms509, which is a LIVE DATA SCANNER...... Philip

 

Yeah, this has been going on for six months. I will eventually get the scan if I don't figure this out but I don't have the cash ATM and could really use the 2nd vehicle. By the times I decided I needed the pros I was out of cash. Lol

 

I have a cheap scan tool. I sometime get a bank 1 or 2 rich or a missfire but it's always P0171 and P0174, bank 1 and 2 upstream sensors lean.

 

I have an Autel MS509 that replaced a Pro1 in my tool box....Autel MaxiScan MS509 OBD2 II EOBD Car Diagnostic Code Reader Live Data - Tmart.com..

I used it for over a yr before I upgrades to the MD801, (needed Transmission and ABS diagnostics)..... Philip

 

It's a weak fuel pump; despite the pressure being only 3 pounds below Hanes specs (With the key engine off) and a Ford Tech telling me my problem wasn't my pressure.

 

How did you determine this.

Full fuel pressure system test?? .. Philip

 

I have a new to us 2000 4.0.

I have the same codes.

After very close inspection I found a leaking intake manifold gasket.

A very common problem with these engines, it is likely that

You have the same issue, so either have the engine smoke tested

Or like I did, use throttle body cleaner at the manifold/head connection.

While replacing the gasket, replace the injector o-rings.

I believe the parts will be around 100.00.

I plan to replace my gasket next week.

 

I diconnected and plugged the return line at the fuel filter and my pressure didn't go up. I have replaced the pump and she's running like new.