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Since I updated to 2.7 my engine speed has been off. It changes, but it's about 15mph higher than actual. It's not the app as I tried downgrading it and it made no difference. Around the same time I saw my fuel pressure was 16-18 where it had been 12-14 before. I thought maybe there had been a bad connection and plugging the plug back in showed a more true pressure reading. Today I was taking my son to daycare and it showed 60psi as my fuel pressure. That scared me a little so while driving I shut the engine off for a sec then keyed it back on (manual trans) and it started running again. The fuel pressure didn't change but I noticed my vehicle speed was correct this time, and stayed correct the rest of the trip. After I got to work I shut off the truck and turned the key to run without starting, the fuel pressure showed as 30, then 44 when I turned it on. Just now an hour later I did the same thing it read 4 & 18psi. Any ideas why it would read like this?

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  • 2 weeks later...
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One thing I'm noticing is the speed sometimes jumps around. Like it'll  jump 3 to 10 miles an hour high and then come back down. This is with smooth study acceleration also

Edited by beren

  • 2 months later...
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On 3/9/2018 at 9:04 AM, Mopar1973Man said:

Nope, the water hammer killed the fuel pressure sensor. You'll need a new fuel pressure sensor and relocate the sensor away from the VP44. This is one reason my fuel pressure sensor is mounted near the ABS module this gives over 6 feet of tube run away from the VP44 and pulses fade with distance. I'm sunning an ISSPro snubber and a needle valve which the needle valve has no purpose other to close the line if a leak occurs. 

 

So what did you do to move it, just get some ends and a length of fuel line? Do you think a small line would help to even out the pulses since it would stretch/absorb more? I just ordered a new sensor, gotta love eBay sales, I got 15% off :-)

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12 minutes ago, beren said:

 

So what did you do to move it, just get some ends and a length of fuel line? Do you think a small line would help to even out the pulses since it would stretch/absorb more? I just ordered a new sensor, gotta love eBay sales, I got 15% off :-)

 

 

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