rslifkin wrote: Ideally, LT fuel trim should be close to 0. In most cases, it'll end up a little off, but not more than a couple percent.
That's what I thought. Now, about the MAF still showing airflow with KOEO?
rslifkin wrote: Ideally, LT fuel trim should be close to 0. In most cases, it'll end up a little off, but not more than a couple percent.
That's what I thought. Now, about the MAF still showing airflow with KOEO?
WildScotsRacing wrote:Knurled wrote: You got 286k out of an original coil pack???Yup! I might have suspected it, but that doesn't account for running better at higher RPM vs lower, since the saturation time decreases with rpm. Or, could this all be from the coil pack???
Could be higher cylinder pressures at low RPM. Or it could be, if the computer isn't detecting misfire, it could be trying to adjust fuel trims richer due to the oxygen-heavy exhaust and it merely hasn't up-borked the higher RPM fuel trims yet.
Unbolt that sucker and give it a very close once-over for cracks, and especially cracks with rust leaking out. Usually on the bottom where you can't see it.
In reply to Knurled:
I just ordered a new Motorcraft from rockauto, and that will take the coil out of the loop. Other posts still have me concerned about the LT trims being the MAF, and the posibility that both coil pack AND MAF have been on their way out for a while.
Ignition first, before worrying about fuel.
Fuel trims, I wouldn't worry about if long term is less than 15%.
Knurled wrote: Ignition first, before worrying about fuel. Fuel trims, I wouldn't worry about if long term is less than 15%.
LT was showing low to mid 20s, ST was 3 to 6. But, I see the point about replacing the coil first to get a good hot spark. After I get the new coil on, how many miles do think I should give the LT to adjust before checking again?
Personally? I'm always pressed for time, so if I've just done a repair and I see an area where longterm is way out of whack, and I see short term is now out of whack but in the opposite direction, I know that like the last two minutes of a sitcom, Everything is Going to Be Okay.
And with an Escort, I'd be giving a huge look at the friggin' PCV hose that always splits and causes a ginormous vacuum leak that you can't find unless you reach down into the middle of F and U and feel where it's sucked itself shut, which means it's also split...
Knurled wrote: Personally? I'm always pressed for time, so if I've just done a repair and I see an area where longterm is way out of whack, and I see short term is now out of whack but in the opposite direction, I know that like the last two minutes of a sitcom, Everything is Going to Be Okay. And with an Escort, I'd be giving a huge look at the friggin' PCV hose that always splits and causes a ginormous vacuum leak that you can't find unless you reach down into the middle of F and U and feel where it's sucked itself shut, which means it's also split...
Lucky me, mine's an '02. PCV hose got moved from the block to the valve cover in '99 (like Ford should have done back in '92). The PCV is clear and sucking.
And the winner is... bad coil pack!!! Got the new Motorcraft unit on the morning, cleared the KAM, followed proper ford re-set procedure and it is running better than ever! (makes me wonder just how long I've been living with weak spark and didn't know it until the misfiring began). GRM is AWESOME 
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