02 Ford Explorer
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02 Ford Explorer
I've searched this forum, google, other forums and I can't seem to find an answer for my problem.
The problem starts after about 5-10 mins of start up and normal driving. First signs usually come leaving a stop light or stop sign. Hesitation, jerkiness, rough acceleration. It's usually slight, just enough to feel it. Soon it really shows up while keeping the truck at a steady speed, say 40 for example.
I finally heard what I would describe as a puffing air sound and figured vacuum leak.. finally! Nope.. it's coming from the rear underneath of the vehicle. I can't hear it in the engine, or the tail pipe.
2002 Ford Explorer xls 4.0 125k miles, I've replaced the air filter, egr valve, pcv valve, cleaned the maf and covered about every hose I can reach with carb cleaner checking for a vacuum leak.
I've yet to try some of the other things due to hearing that puffing sound. Hopefully someone here can point me in a better direction.
The problem starts after about 5-10 mins of start up and normal driving. First signs usually come leaving a stop light or stop sign. Hesitation, jerkiness, rough acceleration. It's usually slight, just enough to feel it. Soon it really shows up while keeping the truck at a steady speed, say 40 for example.
I finally heard what I would describe as a puffing air sound and figured vacuum leak.. finally! Nope.. it's coming from the rear underneath of the vehicle. I can't hear it in the engine, or the tail pipe.
2002 Ford Explorer xls 4.0 125k miles, I've replaced the air filter, egr valve, pcv valve, cleaned the maf and covered about every hose I can reach with carb cleaner checking for a vacuum leak.
I've yet to try some of the other things due to hearing that puffing sound. Hopefully someone here can point me in a better direction.
Logistics Pro
Joined: Jun 2009
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From: Cedar Rapids, IA
Is the sound you hear constant, or variable in frequency depending on engine speed? Could it be described as a humming sound (like a failing fuel pump)? Do you have a scan tool with datastream mode that you could monitor the fuel tank pressure through?
-Rod
-Rod
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The sound is always the same. At idle it's fairly random but while driving it's constant. Going up a hill for instance there is a total lack of power and the puffing is rapid.
As far as a scan tool, no. Tight budget here and I borrowed one from a buddy but it wouldn't link with my truck.
Something new this morning tho, pulling into my driveway having to turn sharply almost killed it. When I began to straighten the wheel the rpms jumped back up and the truck kinda lunged forward.
As far as a scan tool, no. Tight budget here and I borrowed one from a buddy but it wouldn't link with my truck.
Something new this morning tho, pulling into my driveway having to turn sharply almost killed it. When I began to straighten the wheel the rpms jumped back up and the truck kinda lunged forward.
Logistics Pro
Joined: Jun 2009
Posts: 4,819
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From: Cedar Rapids, IA
If the sound is constant and doesn't change with engine speed, I'd have to suspect fuel pump. That doesn't sound quite consistent with the puffing though that you describe. Maybe you have a vacuum leak and a failing fuel pump.
-Rod
-Rod
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Check engine light came one once during a short drive where it was running really rough. Was off the next day and has not came back on since.
I plan to check parts of the fuel system along with plugs and wires in the coming up week. Hope for the best.
I plan to check parts of the fuel system along with plugs and wires in the coming up week. Hope for the best.
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Tensioner failure will be a rattle on start up, followed by more rattling, followed by a failure to run.
These things have o-rings that go bad at the intake to head, and this is similar to what happens when you have such a leak.
Get a code reader and find out what codes are there, and what is stored.
These things have o-rings that go bad at the intake to head, and this is similar to what happens when you have such a leak.
Get a code reader and find out what codes are there, and what is stored.
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A tensioner failure starts at start up only once they collapse it's constant and the chain or chains become so loose you'll lose power becase the timimg is off. If u let them go to long the cassettes come apart and then then chai will slip and bend valves. Look at fuel trim if one side is rich and one lean its a good indication one or more has collapsed. U need a scanner cuase if its a tensioner it could wind up needing a motor before long. Could b a mass scan it
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