Fuel injection problem

1996 Mazda 626 ES 2.5L auto.

I replaced the starter, which entailed disconnecting the throttle body
and stuff around it like fuel lines, coolant lines, accelerator cable,
etc. When I got everything back together, the starter worked but the
vehicle will not idle and runs very rich. I pulled the codes and I
got:

P0100 - MAF circuit malfunction
P0110 - IAT circuit
P0125 - "Excessive time to enter closed loop fuel control".
PO135 - O2 sensor heater circuit malfunction
P0300 (Or PO303) - Random misfire detected on cylinder 3 - I replaced
that spark plug and cleaned up the oil in its cavity so I don't think
it's an issue anymore)
P1170 - Heater O2 sensor (Front RH (Inversion))


Any idea what any of this means? The car runs horrible, does not idle
(goes anywhere from 0 to 2000 rpms) and gets less than 20mpg on highway
instead of close to 30mpg.

I pulled the MAF sensor and looked at it, although not sure what I was
supposed to look at.

SQ > wrote:
>1996 Mazda 626 ES 2.5L auto.
>
>I replaced the starter, which entailed disconnecting the throttle body
>and stuff around it like fuel lines, coolant lines, accelerator cable,
>etc. When I got everything back together, the starter worked but the
>vehicle will not idle and runs very rich. I pulled the codes and I
>got:
>
>P0100 - MAF circuit malfunction
>P0110 - IAT circuit
>P0125 - "Excessive time to enter closed loop fuel control".
>PO135 - O2 sensor heater circuit malfunction
>P0300 (Or PO303) - Random misfire detected on cylinder 3 - I replaced
>that spark plug and cleaned up the oil in its cavity so I don't think
>it's an issue anymore)
>P1170 - Heater O2 sensor (Front RH (Inversion))
>
>
>Any idea what any of this means? The car runs horrible, does not idle
>(goes anywhere from 0 to 2000 rpms) and gets less than 20mpg on highway
>instead of close to 30mpg.
>
>I pulled the MAF sensor and looked at it, although not sure what I was
>supposed to look at.

My guess is that somewhere there is a multipin connector which carries
signals both from the MAF and the O2 sensor and maybe some other things,
and you knocked this connector loose while working.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

Turns out I did not use a Throttle body gasket which caused all this.
I used some silicon sealant but it wasn't enough and there was a major
leak, which confused the computer.

Once I removed the TB again and installed a gasket, all was fine, all
codes gone.

It is a poor design when you have to remove the TB to replace the
starter.

SQ wrote:

> Turns out I did not use a Throttle body gasket which caused all this.
> I used some silicon sealant but it wasn't enough and there was a major
> leak, which confused the computer.
>
> Once I removed the TB again and installed a gasket, all was fine, all
> codes gone.
>
> It is a poor design when you have to remove the TB to replace the
> starter.
>

Whether or not its a "bad design" depends on how hard it is to R&R the
TB. It might be a lot easier to spend $2 for a gasket and 10 minutes to
R&R the TB than it is to spend time lying on your back underneath a car,
which is what is ususally required.

OTOH, the Cadillac Northstar requires you to pop off the intake manifold
to get at the starter... not sure that's altogether the smartest
approach, but it did allow them to make the engine package very, VERY
small for its output.