Help Please, Code 1179, I've replaced the MAS ETC...

[cgerrells]

This is driving me nuts. I put a used MAS from a 96 and the truck ran ok... lost power on hills but drivable. I got my brand new MAS and installed it along with both front oxy sensors. I drove from Cincinnati to Chattanooga and today it tossed code 1179 again.

It runs all day long at 70, but feels like it laking power and missing a little. Has no power going up hill. There is a town here called Soddy Daisy and going up the mountain is a 3 mile twisting climb. I had to almost floor it in order to get up the 3 miles, and by the time I did my temp gauge was almost in the red. EDIT... It blew the radiator! Very top drivers side... It's not the hose. So, I'll have to get it fixed, but this truck went from normal running temp to blowing the radiator in under 2 miles going uphill...

Could it be bad catalytic converters? I have looked at them, and they don't "look" that old... I'm going to run and have them pressure tested in the morning.

But other than that what could it be? I have noticed that I have developed a hairline crack in the header on the passenger side... but it very fine. I'm going to try and run a bead of weld up it, but I don't see that as being the issue.

HELP!

(Oh ya, and I'm kinda stranded here till I get this fixed....)

[Adam in NYC USA]

Its the oxygen sensors. You need a codereader that reads the short term and long term trims. The trims will be full positive or full negative in the old oxygen sensors. They have reached their useful life and need to be replaced.

Put the old MAF back in and replace the offending oxygen sensor. I as a rule change the counterpart since it will start doing the same as the bad sensor.

[cgerrells]

Thanks, I'll give that a shot. I have already replaced the 2 front sensors, so I'll replace the 2 rear ones. also and see what happens.

[Elemental]

Keep on Shotgunning parts. If you replace it all, you'll get it eventually.

What solid testing has been done so far, and what are the results of said tests?

[cgerrells]

Well, I bought the truck a couple weeks ago. It had codes p1187,p1179 and p1177 on the computer. It ran fine durning the test drive and puked on the way home, I would get it going and make it a mile or so and it would just lose power and eventually die. Took about an hour to drive the 15 miles home.

I found a MAS from a 96 in the junk yark, and tossed it on. Code p1179 went away, leaving me with the other two. it was able to drive after the new (used) MAS but still not a lot of power etc. Change the 2 front O2 sensors, seems to be a lot better, was able to power up hills etc, even drove it the 6 hours to Chattanooga and back to Cincinnati, While in Chattanooga I had also put about 800 miles on it locally over the week I was here. The Check engine light stated cleared until 5 hours into the drive down. But like I said, it seemed to run ok, just not where it should be. Code 1179 was on the computer when I got it home to check it. My new MAS was waiting at home so I put it on, and drove a couple days around town etc. No codes. Drove back to Chattanooga still no code. Then yesterday it coded and barely made it up the mountain. popping the radiator in the process from over heating. (Pin hole leak very top drivers side) There are no radiator repair shops here, so my only option has been to pour the stop leak crap in and hope for the best. I let it run for an hour out in the yard this morning reving it up here and there... no issues. Radiator has stopped leaking. Will fix it when I get back to Cincinnati.

I ordered the 2 rear o2 sensors and had them over nighted to me.. hope to get them tomorrow and will put them on. If that solves the issue, I'll swap back to on of the older MAS units and test them again just to see... if one of the older ones work, then I'll keep the new one aside for this 99 or the 98 I just bought.

I purposely bought a 99 and 98 disco 1's to be able to swap the parts around as needed. the 99 (which Is my driver now) will be the donor to the 98 which is a much better shape and lower milage truck that my wife will be using with my kids, so it's more important to keep it running 100%.

[Adam in NYC USA]

I'd also check the thermostat and swap it out. It is probably jammed closed thanks to the harsh treatment you gave forcing loose any crap in the old radiator. Also check the radiator hoses for any collapsing. Maybe the bottom hose is the wrong type/ not reinforced.

[cgerrells]

Originally Posted by Adam in NYC USA

I'd also check the thermostat and swap it out. It is probably jammed closed thanks to the harsh treatment you gave forcing loose any crap in the old radiator. Also check the radiator hoses for any collapsing. Maybe the bottom hose is the wrong type/ not reinforced.

Ok, I have changed the thermostat, replaced all the oxy sensors and the MAS.

The old MAS was causing one problem, it was making the engine "backfire" which was The oxygen sensors also seem to have really help and the Thermostat was sticking and has actually caused the hoses to bulge... time to replace them now too...

Of course the truck is still tossing code P1179, but it ran great the 6 hour drive back home. Held strong in all but the biggest hills, but the steepest one still seemed to max out at 65.

I have now noticed there is another leak somewhere on the drivers side exhaust. I have not been able to locate it and it only surfaced when in gear and under power (accelerating). I had the muffler guys look and they didn't see anything either.

Does anyone make a set of headers for this? Instead of the ain of welding up the hairline crack in the left side one, I think it's just tie to upgrade them anyways.

[supersean]

Originally Posted by cgerrells

Ok, I have changed the thermostat, replaced all the oxy sensors and the MAS.

The old MAS was causing one problem, it was making the engine "backfire" which was The oxygen sensors also seem to have really help and the Thermostat was sticking and has actually caused the hoses to bulge... time to replace them now too...

Of course the truck is still tossing code P1179, but it ran great the 6 hour drive back home. Held strong in all but the biggest hills, but the steepest one still seemed to max out at 65.

I have now noticed there is another leak somewhere on the drivers side exhaust. I have not been able to locate it and it only surfaced when in gear and under power (accelerating). I had the muffler guys look and they didn't see anything either.

Does anyone make a set of headers for this? Instead of the ain of welding up the hairline crack in the left side one, I think it's just tie to upgrade them anyways.

Were you ever able to resolve this... if so, please share!

[Adam in NYC USA]

Originally Posted by supersean

Were you ever able to resolve this... if so, please share!

We can suppose that the headers were fixed and the o2 sensors that were contaminated were replaced? No?

[supersean]

Originally Posted by Adam in NYC USA

We can suppose that the headers were fixed and the o2 sensors that were contaminated were replaced? No?

Well you know what they say about what happens when you assume