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Does this system have a separate VSS to send a signal from the transmission to the computer?
May have nothing to do with your issue, but your first comment about it stalling on coming up to the stop signs was reminiscent of when we were doing an engine swap and either had not not installed the VSS yet, or were running the wrong computer for the type of transmission.
Does this system have a separate VSS to send a signal from the transmission to the computer?
May have nothing to do with your issue, but your first comment about it stalling on coming up to the stop signs was reminiscent of when we were doing an engine swap and either had not not installed the VSS yet, or were running the wrong computer for the type of transmission.
yes im pretty sure vss plays a PARTIAL part in idle speed. As my truck will idle "high" (1500) if i throw the stick in neutral at anything above 25 mph. When speed drops to 10-15ish it falls to "normal" idle of 700ish.
So the VSS could be suspect or the PSOM itself
Does this system have a separate VSS to send a signal from the transmission to the computer?
May have nothing to do with your issue, but your first comment about it stalling on coming up to the stop signs was reminiscent of when we were doing an engine swap and either had not not installed the VSS yet, or were running the wrong computer for the type of transmission.
VSS is in the rear. No reason to suspect it's bad since it is vital to transmission function and the transmission shifts fine.
yes im pretty sure vss plays a PARTIAL part in idle speed. As my truck will idle "high" (1500) if i throw the stick in neutral at anything above 25 mph. When speed drops to 10-15ish it falls to "normal" idle of 700ish.
So the VSS could be suspect or the PSOM itself
I don't think it has a PSOM since the speedometer is cable driven.
VSS is in the rear. No reason to suspect it's bad since it is vital to transmission function and the transmission shifts fine.
The rear VSS is for the RABS system only. The VSS for the computer/speed control is on the transmission tailshaft (2wd) or transfer case (4wd). Just as a FYI for 1991 and older EFI trucks.
The rear VSS is for the RABS system only. The VSS for the computer/speed control is on the transmission tailshaft (2wd) or transfer case (4wd). Just as a FYI for 1991 and older EFI trucks.
That sounds familiar. Thanks for the reminder. I completely forgot that. I checked & sure enough the transmission has a VSS.
1) Stalls a lot when in gear and coming to a stop. Computer does not bump up the RPMs when put in gear. Idles too low in gear.
Ok comming back around, the other possibility here is that the engine is fine but the torque converter isn't unlocking as it should and is dragging down the motor, but that should set codes.
Then we have this...
Originally Posted by David K
No check engine lite. No codes. Passes KOEO and KOER test.
So is the PCM really correct?
Is the "Calibration Decal" still present on the drivers door pillar? If so post it up please. Looks like this..
Ok comming back around, the other possibility here is that the engine is fine but the torque converter isn't unlocking as it should and is dragging down the motor, but that should set codes.
Then we have this...
So is the PCM really correct?
Is the "Calibration Decal" still present on the drivers door pillar? If so post it up please. Looks like this..
FOTF- KA is the PCM number he listed in post 5. My info shows that is correct.
Ok comming back around, the other possibility here is that the engine is fine but the torque converter isn't unlocking as it should and is dragging down the motor, but that should set codes.
Then we have this...
So is the PCM really correct?
Is the "Calibration Decal" still present on the drivers door pillar? If so post it up please.
I thought about the torque converter not unlocking but it doesn't fell like that at all. Something like doing a K turn (D to R, R to D) plus the slight load of the PS pump while doing the maneuver will stall it every time. It idles at 550 (in P) and from what I read, that is what Ford programmed it to do. That's just too low.
I'll look for a calibration sticker tomorrow.
Question: Does anybody know positively whether or not Ford programmed this ECM to bump up the RPM when put in gear? My '92 Ranger with a 3L & A4LD does. My '88 E350 with a 351 & C6 does not. Small engine in the Ranger surely needed it. Big engine in the E350 did not need it. No idea with this 300.
Everything I find says a F0TF-12A650-KA is for a 4.9 but I can't find anything that states it can or cannot control an E4OD. Can you confirm this?
For what it's worth, the transmission works well, so something has to be controlling it. Also Rockauto does match up the "KA" computer with automatic equipped trucks
I thought about the torque converter not unlocking but it doesn't fell like that at all. Something like doing a K turn (D to R, R to D) plus the slight load of the PS pump while doing the maneuver will stall it every time. It idles at 550 (in P) and from what I read, that is what Ford programmed it to do. That's just too low.
I'll look for a calibration sticker tomorrow.
Question: Does anybody know positively whether or not Ford programmed this ECM to bump up the RPM when put in gear? My '92 Ranger with a 3L & A4LD does. My '88 E350 with a 351 & C6 does not. Small engine in the Ranger surely needed it. Big engine in the E350 did not need it. No idea with this 300.
My '87 does not raise the idle speed when put in gear. It is a 4.9 that was originally equipped with a C6, and it has the same computer in it, even though it has an AOD in it now.
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