No acceleration

[vstarrydr]

I have a 2000 Ford Explorer, 4.0, SOHV. One day I was driving to work, it sputters, loses power. I could restart it but it it idled erratically and had no power to drive. When I got it to the house I noticed that three plug wires were sparking to the engine block. Bought a new set of plug wires and after installing them it would idle but not accelerate driving down the road. I then found the coil pack was not firing on 2 cylinders, replaced that, still will not accelerate. To date I have replaced the IAC valve, fuel filter, and replaced 2 bad vacuum lines. I checked all the vacuum lines, tranny fluid, spark plugs. The engine check light is not on, although it was on before I replaced the coil pack, it went off when I replace that. Sitting in park it will rev up, but it is erratic, when in drive, I can't even do 10 mph. The transmission was rebuilt 10,000 miles ago. This is driving me crazy. There was no tell tell sign, all this just happened at once. I just drove it 300 miles the day before, no problem
Thanks.

 

[MadExplorer93]

Is it missing at all or sound like a miss or feel like a miss?

Just cause the spark plugs spark, it does not mean all is well it them as the insulator within it could be damaged and now giving a split spark which it should not do so.

Have you tried any other known good plugs in those two cylinders the coil was not firing on or where the wires were arcing?

 

[vstarrydr]

When at a idle, it runs smooth as can be, but when you start applying the gas the engine shakes and acts like it's not getting gas, but it will stay running, just sputters. I checked the spark plugs by watching them connected to the plug wire, I will have to get some new plugs and see what that will do.

 

[MadExplorer93]

When at a idle, it runs smooth as can be, but when you start applying the gas the engine shakes and acts like it's not getting gas, but it will stay running, just sputters. I checked the spark plugs by watching them connected to the plug wire, I will have to get some new plugs and see what that will do.

Yeah sometimes plugs run ok at idle, but if they are bad they will run like crap under load.

The only other thing i can think of at this time would be a clogged or dirty injector, due to not being cleaned buy fuel being burned, due to the plugs not firing in those 2 cylinders.

You could try some SEAFOAM in the gas tank put about half a can to half a tank or full can to full tank.

You can also put some through the intake by the way of using one of the vaccum lines on the vaccum TEE, usually the cruise control hose is good if applicable on the TEE or the brake booster hose, but many will get a hose and hook it up to the tee and allow the intake to suck about half a can inot the intake. This will help clean any carbon in the upper intake which the air goes into the chambers.

So if you want to try new plugs do so, but before doing so, do the intake with some SEAFOAM then put new plugs in, then put SEAFOAM into tank like i mentioned. You will require only one can of SEAFOAM if half in intake and half to half a tank in the GAS, otherwise buy 2 cans, it only cost around $8.00-$12.99 per can.