Hi,
Recently, couple of maintenance were done. 3 sensors ( Camsoft/cranksoft) sensors were replaced and also Throttle Body was replaced. We have also done many times Throttle Body relearn process.
Our Idle is about 750 to 800 range. I have noticed when I am driving and when I first press brake padel then I see speed/rpm’s goes up slightly which is kind of weird but no problem in stopping it.
Other issue is when I let go gas pedal on lower speed e.g. 30mph, it looks like it takes slightly longer time ( more than 5 seconds) to slow down speed , it feels like it is going on for same speed for couple seconds even though I let go gas pedal. There is no code in scanner.
What needs to be checked ?
Vacuum hoses my wag.
I would add to barkydog’s post below by saying after checking the hoses, check the brake booster.
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That was my first thought as well.
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Hi Guys,
Is there any simple DIY method you guys can recommend to test out ?
The first thing to do is a visual inspection of the vacuum lines and fittings. Then:
- Verify that the symptom occurs with the engine running but the van in Park.
- Disconnect the vacuum line to the booster and plug the line going to the engine. Does the revving occur when you step on the brake?
- Connect a vacuum pump to the booster, and pump to around 15-20 PSI. Does the booster hold vacuum?
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- Verify that the symptom occurs with the engine running but the van in Park.
When in park and engine running, pressing brake does not revs up RPM.
I have also tried let engine run for few mins while in park and press brake pedal and turn off engine while looking whether I see any upward pressure on my leg for next 30 seconds but I did not see any issues holding up brake pedal for 30 seconds or longer.
Does it rule out issue with Brake Booster ?
Do Brake Booster Valve needs be checked further or above check rules out Brake Booster and Booster Valve issue ?
Will check No 2 and 3 soon too