QUOTE(mengsuan @ Aug 6 2012, 01:32 AM)
How do you use it to troubleshoot?
When I whack the car hard with NGV, the vacuum ranges the entire 0.2 to 23in/Hg. With petrol, the vacuum wouldn't drop that low.
NGV?!!??!?! When I whack the car hard with NGV, the vacuum ranges the entire 0.2 to 23in/Hg. With petrol, the vacuum wouldn't drop that low.
The only NGV I played with is a WAGA with campor engine. Came with a missle arm switch

When running on gas, RPM goes slightly higher around 1100rpm, whereas petrol is 800rpm. So, easy to say there must be something intervene the throttle body to suck more air+gas on the GAS idling speed. So, below are the fact and point as I can remember:
1) Gas idling vacuum pull more, suck more gas than petrol to keep the engine running
2) Petrol driven campor engine, normal idling vacuum is around 17in/hg only
3) When applied load(driving for example), vacuum reading shoot up near to 0, once smooth cruising will maintain around 20in/hg when running on gas
4) When applied load, vacuum reading able to maintain within 5~15in/hg when running on petrol. Unless you slam on the accelerator, very rare to see 0 vacuum.
The above should be NORMAL setup for gas/petrol powered motor. As for troubleshooting...
1) On idling, vacuum ranging 15~23 is very healthy engine.
2) On idling, with aircond compressor vacuum drop 2~3in/hg is very normal as part of the torque went supply cooling effect(GaGa's SANDEN compressor is differernt story)
3) On idling, vacuum reading should be STABLE.
4) On idling, if vacuum reading flicker meaning 1 of more valve couldn't close tight
5) On idling, vacuum reading goes above 10in/hg(less than 10) meaning there is a leak somewhere
6) On idling, vacuum point to 0. Your car can't move at all. Even if it move, either instant die off or continue drive slow + hutan bakar effect
7) On normal driving, during pickup vacuum went above 10in/hg(less than 10) is very normal, as long as the car cruising smoothly, vacuum reading should drop down between 10~15in/hg.
8) When driving, above 10in/hg burning rich. Petrol/gas burnt out of nothing
9) When driving, between 10~20in/hg is burning stoich. Efficient.
10) When dirving/downhill, vacuum drop below 25in/hg is burning lean... result is...

Source from Urbandictionary
Hope this help. I'm no sifu, but I normally clutch the car during downhill(provided the road is clear and not in a corner).
QUOTE(vampirewong @ Aug 6 2012, 01:37 AM)
Guys,
1. Just installed cabin filter (from the bulk here) this afternoon. I noticed soft whistling sound coming from the blower when I switch on the air-con to 1. Switch to 2, whistling sound gets louder and switch to 3, blower sound covers the whistling sound. Curious, so I took out the cabin filter and switch on the air-con again. Surprisingly, no whistling sound at all at air-con knob 1, 2 or 3. Anyone got such whistling sound after installing cabin filter?
2. For rust-proofing wheel arch area. Will it void warranty if I apply bitumen spray for front and rear?
10q.
All having the same whistling sound as expected due to paper filter restriction. As long as windspeed does not compromise, rest assured is clean cabin and longer lasting cooling coil.1. Just installed cabin filter (from the bulk here) this afternoon. I noticed soft whistling sound coming from the blower when I switch on the air-con to 1. Switch to 2, whistling sound gets louder and switch to 3, blower sound covers the whistling sound. Curious, so I took out the cabin filter and switch on the air-con again. Surprisingly, no whistling sound at all at air-con knob 1, 2 or 3. Anyone got such whistling sound after installing cabin filter?
2. For rust-proofing wheel arch area. Will it void warranty if I apply bitumen spray for front and rear?
10q.
Rust proofing... don't know. I got no warranty, so never bother to find out. Let others to take this.
Aug 6 2012, 02:23 AM

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