1998 Saturn Sedan 1998 Saturn SE "Service Engine Soon&

MITCH8013

MEMBER
1998 SATURN SEDAN
4 CYL
FWD
MANUAL
145,000 MILES

1998 Saturn P0109 = Manifold Absolute Pressure/Barometric Pressure Circuit Intermittent. Why is this an intermitant problem. These are the hardest to rind, However the "OBD2" foung this code. Will a used junk=yard "Map=Sensor" be sufficiant enough? I know that, because I had to replace one back in 1992 on my Chey Z-24, which is no longer in production. Cost? = $385.00 for a NEW replacement! I am disable on SSDI, I can't afford alot. I bought the car used just 16 days ago. I also had a very rough idle since day one. After "
OBD@ teast I had two codes:
1) PO302 - CYLINDER 2 MISFIRE (I replaced all of the plugs with "Bosh". Rough idle is gone.

Please Advise as to what I should do and the cost to fix this problem.
Thank you,
distrought,
M. Foote

1 Reply

SATURNTECH9

MECHANIC
30,869 POSTS

I hope u didn't put Bosch platnuim plugs in ur car because they carbon fowl after a short time in saturns if u did replace them I recomend Ngk plugs that's what came with ur car new. Do u still have the missifire or did the plugs take care of that?I have seen very few map sensors go bad on those cars I have seen carbon clogging the vaccumm hole on them bad wires to them but very few bad sensors like maybe one or two in over 16 yrs. Also have seen the ground under the intake manifold by egr side of the car loose or not hooked up. But if u do have a bad map sensor yes a junk yard one would work fine since they never go bad. Hope this helps. Also donations and feedback greatly appreachiated.
Louie