98 2.5L runs rough.....

[flaymon1]

the engine sounds like its runing on two cylinders or the timing is off...... But I've reset the timing and installed plugs, wires, and coil packs, PCM,.........any thoughts guys

 

[caveman_joey]

You could try disconnecting or unplugging the MAF (mass air flow sensor) and see if that make any difference. Its quick and easy and would eliminate that out of the situation to move forward from.

 

[flaymon1]

I didn't get a mass air code.......I'll give er a try

 

[tomw]

You could disconnect one plug wire at a time to see the effects... Check fuel pressure? Check fuel flow using a gauge, container and bleed hose. Key on, and catch the gas in a container, measure flow over 10 seconds and multiply to see if adequate. A leaky PCV or hoses can cause bad running, as can a stuck EGR or leaky vacuum lines.
tom

 

[PetesPonies]

You reset the timing?? and how did you do that?

 

[flaymon1]

rotated the the number one piston to top dead center alined the timing marks and installed the belt.................could a blown head gasket cause it to run speratic like its out of time.......the truck seems to have lost some coolent since bringing it home....nothing in the oil or on the driveway......maybe shes leaking coolent into a cylinder......? any thoughts

 

[PetesPonies]

Run the EEC IV diagnostic feature. It will do a running test on the system and report what it finds.

 

[tajvelocity]

I had a lean on bank 2 code for forever. The truck idled poorly, would stall, poor gas mileage. Finally I found a badly cracked vacuum hose and replaced that. That fixed it.

 

[96fordranger]

check the fuel pressure, it should be 40 psi+

did you check that the balancer did not slip. havent paid enough attention on these engilnes to see if they can do it but sometimes the outter rings on the balancer can turn and basicly give you a false reading i had it happen to me on a 250 in my granada. have a compression test done to see if its a head gasket

 

[flaymon1]

did a compression test today I had 180psi on cylinders1-3 but on cylinder4 I had 210psi....whats a normal pressure 210 or 180

 

[PetesPonies]

They both are a bit high. You need to be within 15% ,which those are, but I question whether they really are that high.

 

[flaymon1]

I unplugged the coil packs removed each plug and cranked the engine over and those are peak pressures....

 

[rangergi]

You said any thoughts... Tps? I had a low voltage code on that and it made my truck run rough and stall out.

 

[flaymon1]

how did you fix your low voltage problem, what caused it

 

[flaymon1]

okay I put it back together and at idle I began pulling the pairs of wires off the coil packs.....you could here it drop each cylinder till the number 4 it made no difference so its down a cylinder the number 4 cylinder........its arcing at the coil pack....would a bad injector cause it