Mass Air Flow Meter
08-25-2010, 12:42 PM
#1
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Location: Scotland, Ayrshire coast
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Year: 1999
Model: Grand Cherokee
Engine: 4.7 V8
Mass Air Flow Meter
Is the ZJ fitted with an air flow meter ?. I notice that the air filter seems to go directly to the Throttle Body !.
My mechanical knowledge is - I admit fairly limited but I thought the meter was a main part of a petrol fuel injection system
My mechanical knowledge is - I admit fairly limited but I thought the meter was a main part of a petrol fuel injection system
08-25-2010, 03:34 PM
#2
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Year: 1998
Model: Grand Cherokee
Engine: 4.0
Yes it is on the throtle body where the intake tube connects. Its on the backside (firewall).
08-25-2010, 04:36 PM
#3
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Year: 1995
Model: Grand Cherokee
Engine: 4.0 with all of the noise and clatter
Not a Mass Air Flow sensor, but a Manifold Absolute Pressure sensor. Uses manifold vacuum instead of air flow to determine how much load is on the engine.
08-26-2010, 01:08 PM
#4
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Year: 1999
Model: Grand Cherokee
Engine: 4.7 V8
I have a can of stuff that cleans the injectors valves etc, you have to disconnect the air flow meter before you use it.
When I disconnected the one on my Jag the engine cut out
so I couldn't use it.
I'll try it on the GC later on.
When I disconnected the one on my Jag the engine cut out
so I couldn't use it.I'll try it on the GC later on.
08-30-2010, 08:06 AM
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Last edited by kurtdaniel; 08-30-2010 at 08:39 PM.
08-30-2010, 12:33 PM
#7
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Year: 1999
Model: Grand Cherokee
Engine: 4.7 V8
I sprayed the can into the engine without any problem, time will tell if fuel economy improves as claimed 
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08-30-2010, 02:46 PM
#8
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Year: 1995
Model: Grand Cherokee
Engine: 4.0 with all of the noise and clatter
Don't hold your breath. I jumped a full 1mpg just by lowering my average speed to 65 instead of 70 on the highway. I started out at 15mpg when I first got my 95ZJ. I swapped the injectors out for some Neon 703sand it jumped up to 17.5. Did a complete tune up with new filters, plugs, wires, cap and rotor, and changed the oil to 10w40. I also removed the cross bars from the roof rack, and removed the POS 2"spacer lift. The best I've recorded since all of that was 19.1mpg
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