Ok, so my truck has been driving fine, but today when I was driving to work it started jerking when I accelerated from a stop sign.

It wasn't a violent jerking motion, but it felt almost like the rear end locked up or something. It was something I hadn't really felt before.

Then, I drove it into the parking lot, and it was idling really weird. It was idling around 500 rpm's, while coasting...

I took my lunch break about 15 minutes ago, and when I got in to start it, it sounded really throaty. Like my old carbureted f150. Real lopey sound.

The exhaust was sputtering, basically... Like "bump bump bummmmp bumpbump buuuump bumpbumbumbumbump bump".. if that makes sense...

I accelerated and it continued, and then stopped about 40mph, but wouldn't really go higher than 2000rpms and wouldn't accelerate anymore.

I'm assuming not all 6 cylinders are firing?

There is no check engine light, but my motor is a 2003 and my truck is a 2002, so I dunno if that would affect the computer throwing a code or not.

Anyone have any ideas?

Maybe I just need to change the spark plugs/wires?

 

ya, i was going to say pull a couple of plugs and check for carbon build up and make sure all the plugs have a good connection. If thats all good i would prob check for compression on each cyclinder.

 

How long has it been sitting? It could be on the intake side of things. IAC, IAT, something like that. Check your filter first to make sure there's no visible damage. Clean your MAF filter(rubbing alcohol or they sell cleaner). Also if you want shoot some starting fluid into the intake to see if there's some type of buildup from it sitting?

Aaron

 

That too
get a cylinder compression tester. Could be a blown gasket?

Aaron

 

The truck has been sitting(not driven) for the last year and a half. Minus a couple of months and a few little trips.

 

Well it's good that you drive it a bit. We have a corvette that has been sitting 6+ years and it had brake problems. Now the problems range from carburetor has gelled up and just inactivity has made it go downhill. But if you drived it occasionally every few months that is good.

 

Bad gas? Gunked fuel filter?

 

I don't know.

I wish Tommy Reff still lived here.

 

I have been having the same problem with mine, but it is due to low voltage.

It may be different, but I'm getting the same problems.

I cleaned out my alternator really well (it was muddy/wet) and it has been perfect ever since.

I would rule out the obvious (electrical, plugs, connections, fuses) then take it a step further...

LMK if I can help at all, I was kinda having the same problem

 

sounds like bad gas in the injectors or you droped a cylinder. first try some good injector cleaner and maybe some dry gas, and a good tank of fuel. then from there need to see if its firing on all 6 cyl it might not be.

 

EGR....mine did that horrible idle too its that or a leak by your intake manifold...look for the hose on EGR pull it off and see what you get...Mine went bad and was sending used exhaust back in causeing it to idle horrible and sound like a drag car bum bum bum bum...Run some seafoam soon :)

 

That's what my truck sounds like (high lobed cam sound) and we replaced the EGR last fall, sounds like it's coming from header side of one of the ends of the Y-pipe for me. I think I have to try and replace my o2 sensors, IAT sensor, cats., plugs, wires, distributor, coil, and thermostat and see if any of those help me. I want my ding ding ding idling to stop

 

I just put a screw in EGR tube and it ran alot better..then I opoured some seafoam in and I hooked everything back up and mines runnin like a champ :)

 

if its been sitting for that long the gas is more than likely bad .. get some STABIL and octane booster and a fuel filter.... but i would also check the plugs...good luck

 

also might want to reset the computer for safe measures...

 

it's on a new tank of gas, since sitting...

 

yes but the injectors can still me all gumed up from the old gas

 

how would i know if they are gummed up?

i've driven the truck 500 miles in the last month, with no problem... it just happened all of a sudden, now...

 

iac sounds exactly like what happenend to me. i would def. check the iac if you drop down to about 500 rpms then it jumps up and over revs, sits steady at reular rpms and then drops back down. also this only happens at idle, acceleration, and while coasting. it wont do anything funny while decelerating.

 

Have you thought about the fuel pump? When it went on my Bronco, it gave me that bump when trying to get moving, and I couldn't accelerate past 40mph either. I was also getting low rpms, but that could be due to a bad carbon buildup I had. Running Seafoam through it fixed that part.

 

clogged fuel filter could cause that...

 

Put a bottle of RxP in. Should cost < 10 bucks, and can only help. Other than that, start cleaning electronics (maf, and check the throttle body while you're at it) check vacuum hoses for leaks. Got a PCV valve that might be gunked up? Time for an oil change or tune up? Fuel filters are pretty cheap while you're at it.

Time to show your truck some TLC for letting it sit dormant for so long. :)

 

I fixed it.

When I opened the hood up, last night, w/ a buddy... we noticed it arc'ing on #6...

Replaced the spark plug wires, and it's all good now...

 

i had a problem similar to that about 2 years ago. Fuel filter was ****. It felt like a loss of power, then it would accelerate, then bog down, then acc., then bog down. might be a fuel filter problem.

 

that would do it lol thats one of those you have to find by looking things lol. but i would still put fuel injector cleaner in cause that thing has been sitting to long