TPS report

Sorry, had to.

Throttle Position Sensor. Code 24 for the ol beastie.

Symptoms: Hesitation when coming to a stop and sudden
downshifts (mostly on the highway) when you let off the gas.

Followed the FSM and checked the units voltage. Didn't
see any drops or "obvious" problems. But since I had a
spare from the old throttle body, went ahead and swapped
parts. (current TB is bored out for the supercharger) It
came with all new parts.

So far so good.

Guessing it was a dead spot in the sensor. Probably where
the vehicle sits at idle. Benching it only showed one little
glitch that went away after cycling it back and forth.
Indicative of a flat-spot on a rheostat.

There are a lot of TPS out there. From $19-$60! Most of the
cheaper ones have bad reviews. But $60 for a friggin
variable resistor?! JEEP == Just Empty Every Pocket. ^_^


--
DougW

"DougW" > wrote in message
...
> Sorry, had to.
>
> Throttle Position Sensor. Code 24 for the ol beastie.
>
> Symptoms: Hesitation when coming to a stop and sudden
> downshifts (mostly on the highway) when you let off the gas.
>
> Followed the FSM and checked the units voltage. Didn't
> see any drops or "obvious" problems. But since I had a
> spare from the old throttle body, went ahead and swapped
> parts. (current TB is bored out for the supercharger) It
> came with all new parts.
>
> So far so good.
>
> Guessing it was a dead spot in the sensor. Probably where
> the vehicle sits at idle. Benching it only showed one little
> glitch that went away after cycling it back and forth.
> Indicative of a flat-spot on a rheostat.
>
> There are a lot of TPS out there. From $19-$60! Most of the
> cheaper ones have bad reviews. But $60 for a friggin
> variable resistor?! JEEP == Just Empty Every Pocket. ^_^
>
>
> --
> DougW

Sorry Doug,
I cant help you on that one. Hell. I cant even spell TPS. I've heard of
them going bad, but it beats the hell out of me where it's even located.

"DougW" > wrote in message
...
> Sorry, had to.
>
> Throttle Position Sensor. Code 24 for the ol beastie.
>
> Symptoms: Hesitation when coming to a stop and sudden
> downshifts (mostly on the highway) when you let off the gas.
>
> Followed the FSM and checked the units voltage. Didn't
> see any drops or "obvious" problems. But since I had a
> spare from the old throttle body, went ahead and swapped
> parts. (current TB is bored out for the supercharger) It
> came with all new parts.
>
> So far so good.
>
> Guessing it was a dead spot in the sensor. Probably where
> the vehicle sits at idle. Benching it only showed one little
> glitch that went away after cycling it back and forth.
> Indicative of a flat-spot on a rheostat.
>
> There are a lot of TPS out there. From $19-$60! Most of the
> cheaper ones have bad reviews. But $60 for a friggin
> variable resistor?! JEEP == Just Empty Every Pocket. ^_^
>
>
> --
> DougW
>

And to think I had someone ask me, in a Jeep forum, " Why in the H*** would
you want to get rid of a Renix injection system?" (88 Cherokee) when I
mentioned I'd like to convert my XJ to a carbed 258 with a Torque Command
automatic (now a BA10/5 trans).

Budd

Budd Cochran wrote:

> And to think I had someone ask me, in a Jeep forum, " Why in the H***
> would you want to get rid of a Renix injection system?" (88 Cherokee)
> when I mentioned I'd like to convert my XJ to a carbed 258 with a
> Torque Command automatic (now a BA10/5 trans).

True. But then again my Chevy's Rochester 4M4 nearly drove me up a
friggin wall. Carbs just don't like it when you change altitude
all the time. But it did work well after all the emissions crap was
ripped out.


--
DougW

"DougW" > wrote in message
...
> Budd Cochran wrote:
>
>> And to think I had someone ask me, in a Jeep forum, " Why in the H***
>> would you want to get rid of a Renix injection system?" (88 Cherokee)
>> when I mentioned I'd like to convert my XJ to a carbed 258 with a
>> Torque Command automatic (now a BA10/5 trans).
>
> True. But then again my Chevy's Rochester 4M4 nearly drove me up a
> friggin wall. Carbs just don't like it when you change altitude
> all the time. But it did work well after all the emissions crap was
> ripped out.
>
>
> --
> DougW
>

Now you know why I liked Carter carbs best. <VBG>

But in all honesty, if you leave the air valve control spring setting alone,
the 4M series carbs worked very well and very dependably. Some dealers,
however, didn't take the time to adjust , say for Denver, on new cars and a
lot of ill-informed people thought that backing off the spring would make
the car run better.

No carb really liked altitude changes because the jetting was essentially
set for a certain air density (barometric altitude) and there just wasn't
enough air mass to create the suction needed to flow the fuel correctly. For
high altitudes you need a smaller carb or smaller jets. My 65 225 /6 with a
Carter BBS single didn't gasp once going over CO's Monarch Pass while towing
a 4500 pound trailer ... now the 9" drum brakes (65 Valiant), on the other
hand, coming off the mountain . . . . . . . .

Budd