I put a scanner on it, and most thing look ok as far as the sensors are
concerned. There's nothing stuck at one setting, and the readings look
ok. Except maybe for the O2 sensor. That reading swings around quite a
bit. Anywhere from .19v to .80v. As I step on the throttle, I can see
the vacuum drop, and the timing advance drops to 0, but no power. It
also stays in 'closed loop' until about half throttle. I guess the next
thing I'll do is put a fuel pressure tester on it & see if it's getting
enough gas. Is sure seems to idle smooth if I leave it alone. If I let
up on the gas suddenly, it'll stumble down to about 200 RPM, then recover.
I tried to perform one more scan before I came back into the house, and
the computer has stopped responding to the scanner. I can still monitor
all the sensors, though. Weird.
WP wrote:
>
> Hi,
>
> I just swapped the engine in my Dakota ('94, 4x4, 5.2) and I can't get
> it to go over 800 rpm. I put in a used engine from a reputable place.
> It was hard to get started, and I had to keep pumping the pedal
> slightly for about the first minute or so. After that, it will idle
> at ~400 RPM. It will slowly let the RPMs come up over a period of
> several minutes, but even at full throttle it won't go above 800 rpm.
> I've got good oil pressure and the cooling system is full. It also
> seems to be running very hot, as the temp gauge slowly climbs towards
> 'hot'. The radiator is new, as is the thermostat. The 'Check Engine'
> light only gives me code 12, which doesn't help.
>
> Has anyone seen anything like this before?
> Thanks.
>
> Warren
>
>
>
This archive was generated by hypermail 2b29 : Fri Jun 20 2003 - 12:05:04 EDT