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MAF or MAP or both?? Where is it?? Engine hesitation. #747879
May 01st 2019 4:55 am
May 01st 2019 4:55 am
Joined: Sep 2015
Posts: 91
So-Cal
C
chevydude1987 Offline OP
journeyman
chevydude1987  Offline OP
journeyman
C
Joined: Sep 2015
Posts: 91
So-Cal
'87 G20 305 TBI. I dont think it has MAF sensor., but maybe a MAP?? Has to have at least 1, right?? Where at?? Im getting some hesitation on takeoff and sometimes while highway cruising. Idles fine and no stalling. Just thought I start there I guess. What else should I look into regarding the engine hesitation??
Thanks.

Last edited by chevydude1987; May 01st 2019 4:58 am.
Re: MAF or MAP or both?? Where is it?? Engine hesitation. [Re: chevydude1987] #747882
May 01st 2019 7:53 am
May 01st 2019 7:53 am
Joined: Nov 2013
Posts: 3,405
Michigan
Dyno_Dave Offline
pooh-bah
Dyno_Dave  Offline
pooh-bah
Joined: Nov 2013
Posts: 3,405
Michigan
No MAF with GM TBI.

Re: MAF or MAP or both?? Where is it?? Engine hesitation. [Re: chevydude1987] #747894
May 01st 2019 12:32 pm
May 01st 2019 12:32 pm
Joined: Nov 2013
Posts: 1,168
West Texas
W
Wedgy Offline
old hand
Wedgy  Offline
old hand
W
Joined: Nov 2013
Posts: 1,168
West Texas
Hi Chevydude,

PN 16017460 1987-90 MAP sensor

Bolted to a bracket on the passenger side of the motor between the throttle body and the valve cover. MAP sensor is mounted outboard side of the bracket, EGR solenoid is mounted inboard on the throttle body side.

A visual check of all vacuum lines, hoses, electrical connections, wiring, is a good place to start. Then troubleshooting. TPS? Other sensors? Air filter? Warm air blend door? Injectors clogged? Timing, and Tune? Not necessarily in that order...
Any chance of restriction in the exhaust? might check, but probably something simple. Fuel pump at the worst. Good wrenching in there!


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