My car has recently been showing code 34. I know it has something to do with the MAP sensor. Does that mean I need a new one? I checked all the little hoses, and they're connected. What to do?
------------------ sqoach@yahoo.com
84 SE (project car?) 85 Coupe (parts car) 86 SC (daily overheating)
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12:56 AM
PFF
System Bot
FieroMaster88 Member
Posts: 7680 From: Mattawan, MI Registered: Nov 2000
The code 34 is set when the closed throttle speed is 50 RPM above or below the correct idle speed for 30 seconds. The book says to check for vacuume leaks. Also suggests to change the IAC senser (Idle Air Control). Not sure if the V6 has one of those, think the v6 has the Mass air flow sensor, so the IAC is only on the 4 cyl. My 84 coupe had the same problem, changed the IAC sensor (which is connected to the TBI unit) and the code went away. Just a thought.
------------------ James Essar AOL IM Name: FieroMaster88 88 Coupe 30,000 miles 84 Indy Fiero (restoration Project)
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02:34 AM
blade56_2001 Member
Posts: 13 From: Tucson, AZ. USA Registered: Aug 2000
Whenever I got my car, It's had this throttle "problem" When I start the car, the RPMs are about 2000. But when I give it a little gas, it goes back down to normal. This doesn't happen all the time, but most of the time. Always on a "cold" start and sometimes after I've been driving for a while.
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12:56 PM
Fierowrecker Member
Posts: 1858 From: Lowell, MI. USA Registered: Mar 2001
Originally posted by sqoach: Whenever I got my car, It's had this throttle "problem" When I start the car, the RPMs are about 2000. But when I give it a little gas, it goes back down to normal. This doesn't happen all the time, but most of the time. Always on a "cold" start and sometimes after I've been driving for a while.
I have the same problem, sticking throttle plate... If I blip the pedal, the rpms go to normal, but sticks on opening... crash...
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06:31 PM
Apr 17th, 2001
gearhead313 Member
Posts: 13 From: Allison Park, PA, USA Registered: Apr 2001
ya...code 34 is map sensor code. most likely it needs a map sensor. sometimes it might be wireing, but since the computer got the code to display, the wireing is probably ok, since the code is for low voltage or high vac. just blow a sensor in it, clear the codes and see if it comes back, if it does, then on to plan B!!
------------------ 85 fiero GT 4-speed 2.8 V6 .060 over big cam and head work... "~5LTRETR~"
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03:08 PM
HummelHund Member
Posts: 1037 From: Niceville, FL, USA Registered: Apr 2001
I got the same code when I ran the codes on my '84 SE. I replaced the MAP sensor but it still didn't idle exactly right, replaced all of the vaccuum hoses and it almost idles normally. I have to replace the IAC now, it's still not idling right. Just make sure you check all the vaccuum hoses by using WD-40 (thanks for the tip, Wade). Hose is $.50/ft. at autozone, a lot cheaper than the $27 MAP sensor.
------------------ Sean W. '84 SE 2M4 WS6 (restoration project to become daily driver) '84 Sport Coupe ($150 running car)
