bad coil symptoms, just replaced coil-W/plugs/wires & still having issues?

[redn610]

Bought an 07 Explorer about 2 months ago from a dealership, with in just a few days it started dying on me, mostly accelerating from a stop, took it back for repair and they guessed fuel pump, got it back everything seemed ok and working, about a week later while driving on the highway the engine started a small ticking-loss of power, I turned around and drove back to the dealership where I got it from and the whole 30 mile trip back the condition worsened with quick massive losses of power and dying continuously on the last mile in, so about a week later I got it back, dealer said they replaced the coil, 3 plugs, 3 wires. Drove it for about a month with almost no issues (about 2 times it acted up but went away after being turned off and back on) but about a month in to the repair (they said) it was back to dying and loss of power and then re-gain while driving over and over. I called the dealer and was out of the 30 day warranty so I got told sorry (the finger). Now 2 things, it always seems to act up when the AZ temp is about 105+, I was in California for a week driving most of the time with no issues but temps were 70s & 80s. On my way back to AZ it acted up again and I barely made it home. So today I replaced the coil plugs and wires (the dealer never replaced anything-still had original parts). After the replacements I started it back up and it worked great, drove for about 20 mins (in the morning hours) no problems, but I just drove this afternoon with temp of 107 and having the same issues. Any help? Its acts like a coil problem but I just replaced that, anyone have some ideas about what could be wrong? Thanks.

Vehicle is 2007 Ford Explorer XLT, 4.0 SOHC Engine, 4x4, about 98K Miles, and this SUV looks like it has seen lost of rain &/or snow in its earlier life.

 

[Flag Gibby]

Any DTC's?? I am thinking throttle body and MAF need to be cleaned as a maintenance thing since you just got it. Also, I would check the fuel pressure at the rail when it starts acting up. I have had vehicles that would run fine until they got hot and the fuel pressure dropped too low causing the vehicle to vapor lock/shut off and the fix was a new fuel pump.

 

[ascrap2003]

Check the codes first, did you try the plugs first? If all is good then the next thing to check is compression

 

[ascrap2003]

Also I hate to say it not that I'm a wiz or anything but the techs out there today that work at dealers suck so do guys at smaller shops very few guys actually know what they are doing with that said your best bet is right here in this forum who else is gonna know better about your truck besides people that drive em and fix em everyday

 

[redn610]

cant find fuel rail schrader valve

yes I have pulled the codes on 2 different occasions, got fuel pump code twice and the O2 sensor code once and then the spark plug code once. so right now I want to test the fuel pressure from the rail, but I have been looking online and on my vehicle and for the life of me cant find the schrader valve. anyone now where it is or have a pic?

 

[Flag Gibby]

From my post on your other thread: Wow, I knew it was under the intake manifold but didn't realize it is 100% sensor now... or can you use the port on the top to check it??

See this diagram and accompanying images of the part: http://www.fordparts.com/Commerce/P...earch=true&year=2007&make=Ford&model=Explorer