Friday, June 12, 2015

Oh how I hate you Temp Sensor II

1978 VW Campmobile in Rockford IL It's been about four years since the last time I posted about my bus. I'm happy to report that Tuesday June 9th, 2015 is the day I believe we finally identified the cause of the problem (e.g. hesitation, bucking, stalling) that has plagued my 1978 VW Campmobile (2.0 FI) for years. I have enough evidence now to blame the Temp Sensor II (0 280 130 012) for most of my stress and headaches since 2008.

Colin from IAC was onsite for his 2015 visit this week. We spent the first part of the day fine tuning and troubleshooting why this bus was running so poorly. The fuel in the tank was stale and we found the fuel filter was jammed with crud. Unfortunately a tune-up, fresh fuel, and a new filter did not eliminate the symptoms. I was getting a little worried that it was going to be a very late night. That is until Colin picked up the Temp Sensor II wire connector during a vacuum test and instantly noticed an improvement. I had a spare sensor in my collection of parts so we installed it and then readjusted the AFM.

I was prepared for some type of disappointment however it never occurred. During our first test drive the bus ran better than it has in years! It’s not like we haven’t looked at the Temp Sensor II before. Colin even tested it himself this year and confirmed it was within spec. I also tested it several times in 2012.

After Colin’s visit this year and replacing the Temp Sensor II, I completed a 100 mile test drive and it was smooth driving the entire time. I should say that I’ve only been able to drive my bus 20 miles in 2 years. I barely made it around the block and back to the garage the last time I tried it in November 2013. After 100 miles I’m very optimistic that replacing the Temp Sensor II has resolved the problem.

It’s hard to believe that I’ve been chasing this gremlin for almost 7 years. I was starting to accept the possibility that my bus would always choke and stall on the road. I’m going to nominate Randy in Maine for an award because he was the first to call out the sensor as a possible culprit back in 2008. I’ll also nominate Colin for his help this year to confirm. I'm so glad to be back on the road again!!!

Here's the full list of the completed work on 6/9/2015:
1. Valve adjustment
2. Cleaned valve covers
3. Replaced points (311-998-063)
4. Adjusted timing
5. Drained old fuel
6. Replaced fuel filter (133-133-511)
7. Checked fuel pressure
8. Adjusted AFM
9. Checked vacuum
10. Replaced Temp Sensor II (0 280 130 012)
11. Fixed horn
12. Replaced hub cap

My goal for the next IAC Visit in 2015:
1. Resolve oil leak (main seal?)

Odometer: 148245

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