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It's been two weeks since I last saw a P00128 code and related problems. I say it has been fixed by cleaning the engine temperature sensor connector in the block. Next, I'm working on a very slow AC refrigerant leak. It's been a few months since I topped it off last and I've noticed the outlet temps...

I have an iPhone and would be glad to work with you to see if we can make it happen.

Congratulations, Fred. Mighty fine job you and Jimmy did! You seem to be piling up the trophies lately.

I'll just let it ride and see what happens.

I'm cautiously optimistic that the engine temp sensor connector was the cause of both these recent problems. I've seen no more of the starting anomalies nor the P0128's with the associated cutoff of the AC.

I put a 160° thermostat in there over a year ago until I started seeing the P0128"s. Looking online I saw that some thought that the cause was the low thermostat. Consequently, I put the original thermostat back in. All was OK until now when I began seeing the P0128's again. This brings us up t...

I installed a new Stant SuperStat that I had bought many months ago (I don't remember why). The SuperStat is different than your normal everyday thermostat. Here's the marketing material: Unlike conventional thermostats that continually open and close to achieve the proper operating temperature and ...

I drove the truck and made some observations today. I watched the engine temperature display on my UltraGauge. It wasn't long before I noticed that the temperature had not increased above 96.8°. It stayed that way for the 20 minute drive. I also noticed that the ECM stayed in open loop mode the whol...

I did a bit of research and came up with this thread which describes what is going on: https://www.chevymalibuforum.com/threads/intermittent-p0128-and-gauge-fail.12036/ This issue also came back yesterday. I believe the original thermostat is currently in the engine now. I have a new thermostat on ...

Took the TBSS out for the day yesterday and the starting issue seems to have gone away (for now, at least). I'm wondering if I have an injector intermittently leaking fuel pressure. If the problem comes back I'll have to get serious about understanding my fuel system. It came back yesterday. It see...

Another thing popped up on my trip yesterday. It was a hot and humid day and the AC suddenly stopped cooling. Then I glanced down at the dash and saw an icon lit in the shape of an analog gauge. I had seen this before in the past and it reminded me that I could circumvent it by resetting the code. I...

Took the TBSS out for the day yesterday and the starting issue seems to have gone away (for now, at least). I'm wondering if I have an injector intermittently leaking fuel pressure. If the problem comes back I'll have to get serious about understanding my fuel system.

Maverick wrote:Maybe a fuel check valve leaking? Maybe try leaving the key on for a few seconds before cranking to see if that fixes it.

Yes. That appears to allow it to start normally. Although, now I have to wait for a few hours to do more testing on that.

I recently (about 17k miles ago) replaced the plugs and cleaned the MAF. This thing appears to be related to sitting for some time. Once it starts, I need to wait for a while (maybe an hour or two or overnight) before I can make it happen again. Restarting, it starts quickly (no stumble). It also ru...

Within the last 5 days, I noticed a change in behavior at startup. Normally, I do a quick hit with the key and the engine fires and runs instantly. Recently, however, it has been stumbling to life. This stumbling lasts only 1 or 2 seconds then it appears to run normally. it happens intermittently. I...