diagnose this
in [Technical]
|
Prev: Come and see this
Next: 1955 Mike Hammer movie
From: Jim Warman on 21 Mar 2010 01:50 Codes? Is it using more oil than normal? Check plugs #2 and #5 "Ashton Crusher" <demi(a)moore.net> wrote in message news:f139q5pqoneubqpu8066a75eamlufajvm3(a)4ax.com... > 92 Ford Explorer 4.0L OHV V6 130K miles, 10K on double plat plugs, > nearly new plug wires. O2 sensor was replaced about 40K ago > > Sometimes Runs rough when first started. Not just first start of the > day, but even when warmed up and then shut down for 15 minutes it will > often run rough initially like one cylinder is missing. > > Roughness usually goes away after it's warmed up but lately it's > started to have a bucking/missing/popping under light acceleration. > Giving it more gas usually smooth's it out. It will run on up to > redline and shift into the next gear and has no problem running up to > 90 mph. So unlike what I think of as the typical 'worn out plug" > misfire that shows up at high rpm and high load, this show up at > medium rpm light to medium load. > > It has not turned on the check engine light > > Any ideas? > > Things I'm thinking it might be.. > > water in gas > bad gas > bad injector(s) > bad coil
From: PeterD on 21 Mar 2010 08:03 On Sun, 21 Mar 2010 05:47:20 GMT, "Jim Warman" <mechanic(a)telusplanet.net> wrote: >Cap and rotor? Are you familiar with this engine? > I thought my "(OK, I hope this engine does have a cap/rotor!)" disclaimer was enough to say that it was general advice. I deeply and humbly appologize if I caused you distress, but I've seen the problem I described before and figured it was a good guess. > >"PeterD" <peter2(a)hipson.net> wrote in message >news:crh9q5p4javpjfh4jnrtiosilif70gbe3h(a)4ax.com... >> On Sat, 20 Mar 2010 01:58:58 -0700, Ashton Crusher <demi(a)moore.net> >> wrote: >> >>>92 Ford Explorer 4.0L OHV V6 130K miles, 10K on double plat plugs, >>>nearly new plug wires. O2 sensor was replaced about 40K ago >>> >>>Sometimes Runs rough when first started. Not just first start of the >>>day, but even when warmed up and then shut down for 15 minutes it will >>>often run rough initially like one cylinder is missing. >>> >>>Roughness usually goes away after it's warmed up but lately it's >>>started to have a bucking/missing/popping under light acceleration. >>>Giving it more gas usually smooth's it out. It will run on up to >>>redline and shift into the next gear and has no problem running up to >>>90 mph. So unlike what I think of as the typical 'worn out plug" >>>misfire that shows up at high rpm and high load, this show up at >>>medium rpm light to medium load. >>> >>>It has not turned on the check engine light >>> >>>Any ideas? >>> >>>Things I'm thinking it might be.. >>> >>>water in gas >>>bad gas >>>bad injector(s) >>>bad coil >> >> You've replaced the cap/rotor? One real possibility is moisture in/on >> the cap/rotor causing a mis-fire, when the engine warms the moisture >> evaporates, then re-condenses when the engine cools. >> >> (OK, I hope this engine does have a cap/rotor!) >
From: ben91932 on 21 Mar 2010 14:23 > >He said it doesn't turn the light on, so there isn't going to be fault > >codes. > Not all faults light the MIL. You can still get useful stuff from koeo and keor routines. Time to cover the basics... Compression and vacuum, frp, egr (if equipped) , alt for a/c output, vacuum leaks, ect vs act, sludged intake/pcv, dirty maf, lazy 02's, ign stuff etc These can be a pain as the scanner doesnt always narrow things down well. I have fixed dozens of these by shoring up the grounds, especially the 02 ground under the intake manifold. HTH Ben
From: Ashton Crusher on 21 Mar 2010 18:19 Nothing that turns on the check engine light. Guess I'll have to run it down to autozone and see if there are any hidden codes their scanner turns up. Never uses oil. I'll check the plugs. On Sun, 21 Mar 2010 05:50:43 GMT, "Jim Warman" <mechanic(a)telusplanet.net> wrote: >Codes? Is it using more oil than normal? Check plugs #2 and #5 > > >"Ashton Crusher" <demi(a)moore.net> wrote in message >news:f139q5pqoneubqpu8066a75eamlufajvm3(a)4ax.com... >> 92 Ford Explorer 4.0L OHV V6 130K miles, 10K on double plat plugs, >> nearly new plug wires. O2 sensor was replaced about 40K ago >> >> Sometimes Runs rough when first started. Not just first start of the >> day, but even when warmed up and then shut down for 15 minutes it will >> often run rough initially like one cylinder is missing. >> >> Roughness usually goes away after it's warmed up but lately it's >> started to have a bucking/missing/popping under light acceleration. >> Giving it more gas usually smooth's it out. It will run on up to >> redline and shift into the next gear and has no problem running up to >> 90 mph. So unlike what I think of as the typical 'worn out plug" >> misfire that shows up at high rpm and high load, this show up at >> medium rpm light to medium load. >> >> It has not turned on the check engine light >> >> Any ideas? >> >> Things I'm thinking it might be.. >> >> water in gas >> bad gas >> bad injector(s) >> bad coil >
From: Ashton Crusher on 21 Mar 2010 18:20
On Sat, 20 Mar 2010 09:03:50 -0400, PeterD <peter2(a)hipson.net> wrote: >On Sat, 20 Mar 2010 01:58:58 -0700, Ashton Crusher <demi(a)moore.net> >wrote: > >>92 Ford Explorer 4.0L OHV V6 130K miles, 10K on double plat plugs, >>nearly new plug wires. O2 sensor was replaced about 40K ago >> >>Sometimes Runs rough when first started. Not just first start of the >>day, but even when warmed up and then shut down for 15 minutes it will >>often run rough initially like one cylinder is missing. >> >>Roughness usually goes away after it's warmed up but lately it's >>started to have a bucking/missing/popping under light acceleration. >>Giving it more gas usually smooth's it out. It will run on up to >>redline and shift into the next gear and has no problem running up to >>90 mph. So unlike what I think of as the typical 'worn out plug" >>misfire that shows up at high rpm and high load, this show up at >>medium rpm light to medium load. >> >>It has not turned on the check engine light >> >>Any ideas? >> >>Things I'm thinking it might be.. >> >>water in gas >>bad gas >>bad injector(s) >>bad coil > >You've replaced the cap/rotor? One real possibility is moisture in/on >the cap/rotor causing a mis-fire, when the engine warms the moisture >evaporates, then re-condenses when the engine cools. > >(OK, I hope this engine does have a cap/rotor!) It's a good thought but it is distributorless. It could be that the wires aren't very good I suppose, they are new Bosch and I've never had trouble with Bosch before but there's always a first time. |