MAP sensor operation

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MAP sensor operation

Home > Discussion Forum > Mechanic's Corner - Engines

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All Messages in Thread	Author	Date
MAP sensor operation	Lenny	4-30-08
1995 454 MOTOR HOME. MANIFOLD VACUUM IS 22Hg. WHEN MAP SENSOR IS CONNECTED ENGINE DIES. MANUALLY APPLY VACUUM TO MAP AND RUNS GREAT UP TO 17Hg ON HAND PUMP. AFTER 17 ENGINE QUITS. ANY TAKERS?? MAP, o2, IAC, EGR TPS ALL CHECK OUT. SOME QUESTION ON FUEL PRESSURE BEING LOW AT 15-18 PSI. OEM PUMP, PULSATOR AND PRESS REGULATOR
Re: MAP sensor operation	BUBBA THE BUS TECH	4-30-08
First what is the spec for fuel pressure? This is a critical value, but chevy is pretty poor at getting closer that 10% + or -. Next the easiest way to think about you map sensor is to think that the engine computer just takes several inputs and does basic math. TPS+MAP+Temp+EGR X Block learn = This much fuel. If the engine is cold the computor just run off the calculation. When the engine is hot it adjusts and learns off the o2 sensor and knock sensor. If the vacume signal is low to the MAP it adds fuel. IF the MAP reads high it reduces fuel. If there is a low fuel pressure or low flow problem can be disguised by unplugging the MAP. I actually got a car home this way as the little piece of hose in the tank between the pump and the pipe was split and bypassing into the tank. Unplugging the MAp richened the mixture up untill it would start run and drive at light throttle settings. It sounds like you have a lean condition and the MAp being disconected allows it to run. Figure out your fuel pressure problem then plug your MAP back in and see how it goes. Good Luck
Re: MAP sensor operation	susan	4-30-08
Hello Seller, I came across your ad and I'll like to know the following questions regarding the ad.,but before i proceed on this transaction i will like to ask some question as follow. i can only raise certify check for the payment of your item so i will like to know if the item is still available and also if is in good condition Please your answer on this, will enable me to issue your payment to you asap, 1. Do you accept a ( Certify Check ) as a mode of payment 2.] What is the firm price of the item? 3) Will you let our shipping company to come to your house for the pick up of the item? 4)Do get back to me with your contact info where you want the payment to address to. 5) Will you be able to send the excess fund back to the shipping company via western union money transfer same day you recieve the check....I'll like to have the response to these question in your earl! ie! st conviniency'Hope to hea! r from you soon. Thanks.... Susan........