map sensor
Thread Starter
Intermediate
Joined: Oct 2009
Posts: 31
Likes: 0
map sensor
Hi everyone I know this sounds like a silly question but where would I find the map sensor on my 87 vette I would of thought it would of been on the firewall but i cant seem to locate it 
Drifting
Joined: Aug 2006
Posts: 1,624
Likes: 2
From: Canandaigua New York
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Thread Starter
Intermediate
Joined: Oct 2009
Posts: 31
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i dont know where to start with it actually. first off it starts like its loading up then if it idles for about 2 minutes its just like you flick a switch and it clears right up.Then when i back out of the garage and shift to drive it stalls several times.then once it decides to drive away it seams like its loosing spark or fuel on a couple cylinders.if you go alone easy its fairly manageable but when i get passed by a four cylinder beretta and cant catch it i get fed up i have replaced all filters,plugs, wires,coil,tps,egr,checked vacuum hoses numerous times,checked all grounds,changed alternator,starter,checked fuel preasure and many other things and i cant get it figured out.any help would be great...
Thread Starter
Intermediate
Joined: Oct 2009
Posts: 31
Likes: 0
ok when i start it it idles very poor just like a carburated engine that has the choke stuck on and it likes to have alittle excellerator peddle to get going but then after about 2 minutes it just flicks right into a good smooth idle.....
Team Owner
Joined: Jan 2009
Posts: 73,568
Likes: 33
From: Somewhere in Mo
St. Jude Donor '09-'10, '14
It sounds like you're not getting enough air and when you press the go pedal, it opens up the TB and allows more air in.Take it out and clean it, using a good carb cleaner, and see if it helps. If it does I would replace it but that's up to you.
Mine was doing that and in the early stages if I held the pedal it would eventually straighten out. But this fix is temporary and it will eventually go out. Clean the TB while you're at it.
This is a "very" common problem.
Drifting
Joined: Aug 2006
Posts: 1,624
Likes: 2
From: Canandaigua New York
Try this link.
There is an explanation on how to test the injectors.
http://forums.corvetteforum.com/c4-t...ctors-bad.html
About 6 posts down.
There is an explanation on how to test the injectors.
http://forums.corvetteforum.com/c4-t...ctors-bad.html
About 6 posts down.
Team Owner
Joined: Jan 2009
Posts: 73,568
Likes: 33
From: Somewhere in Mo
St. Jude Donor '09-'10, '14
Hey joe, how did your fuel test come out?
Also here's most all you need to know about injectors. There's a video on how to ohm them in this as well
http://forums.corvetteforum.com/c4-t...questions.html
Also here's most all you need to know about injectors. There's a video on how to ohm them in this as well
http://forums.corvetteforum.com/c4-t...questions.html
