SPONSORED LINKS

1989 Cadillac Hearse map sensor

Tiny
CAROLRAE
  • MEMBER
  • 1989 CADILLAC HEARSE
  • V8
  • AWD
  • AUTOMATIC
  • 72,000 MILES
We did a tune up on my caddy and immediately check engine came on. We had it tested. Said map sensor went out. After 3 weeks to find RIGHT ONE and had to redo map sensor AND redo new harness. The light STILL comes on. We undid the battery for a half hour and put it back together and lite STILL comes on and runs worse than ever. Idol off or timming. Any suggestions? I need help
SPONSORED LINKS
Thursday, August 19th, 2010 AT 7:21 AM

5 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Do you have a good vacuum supply connected to it?
Was this
answer
helpful?
Yes
No
Thursday, August 19th, 2010 AT 7:31 AM
Tiny
CAROLRAE
  • MEMBER
  • 3 POSTS
Do you mean from the little hose that gets connected to the mapsensor itself underneath? I havent tried it. Do I try it with car running? Im a female and ive been workin right along the man workin on my tuneup. So I do know the hose you might be talkin about. How can I tell? Put paper to it and see if it sucks to it>?
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Thursday, August 19th, 2010 AT 7:37 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
That's what a MAP sensor does. It measures he engine vacuum so it has to have a good sealed line to the vacuum supply. You should be using a vacuum gauge to measure it. If that's not the problem, then your going to need a scan tool to read the sensor data in the ECM. You could have a wiring problem.
Was this
answer
helpful?
Yes
No
Thursday, August 19th, 2010 AT 7:55 AM
Tiny
CAROLRAE
  • MEMBER
  • 3 POSTS
Thanx for advice. Immediatly after a tune up the map sensor gave problems. We replaced original one with a whole new senor type and harness cus the 1989 piece was obsolete. So they say cuis it took 3 weeks of searching for part. We will heck the vacume and wires to night. THANK YOU! So much for helpin us out here. Hugs
Was this
answer
helpful?
Yes
No
Thursday, August 19th, 2010 AT 8:11 AM
Tiny
CFERRY1
  • MEMBER
  • 28 POSTS
Dear carolrae -

It is possible that my 1990 Cadillac is similar to your 1990 Cadillac Hearst. I am sure these vehicles are becoming somewhat obsolete. I would be interested in talking with you about your vehicle. I may be contacted at email "ferrycha@hotmail. Com"

Thank You
cferry1
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Friday, January 20th, 2012 AT 8:46 AM

Please login or register to post a reply.

Sponsored links