 |
 |
 |
|
|
 |
| Search | Car Forums | Gallery | Articles | Helper | Quality Dog Food | IgorSushko.com | Corporate |
 | | ||
| |
|
| Latest | 0 Rplys |
|
|||||||
| Problem Diagnosis Got a problem you can't fix? Post here and one of our members will answer as soon as possible. |
 |
 Show Printable Version |  Email this Page | 
Subscribe to this Thread
|
|
|
Thread Tools |
11-19-2010, 01:45 PM
|
#1 | |
|
AF Newbie
Join Date: Nov 2010
Location: sandpoint, Idaho
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
|
map sensor failure symptoms
1991 Blazer has bad fuel economy, Idles good, but when to acceleration it has a real bad hesitation. I have to feather the accelerator to pick up speed. Could this be the MAP Sensor
Thanks |
|
|
|
|
11-19-2010, 02:20 PM
|
#2 | ||
|
AF - Advisor
 
Join Date: Sep 2005
Location: New London, Missouri
Posts: 16,690
Thanks: 5
Thanked 121 Times in 120 Posts
|
Re: map sensor failure symptoms
Quote:
What is the map sensor reading at key on engine off and engine running.? Always check for good vacumn to map sensor. Any check engine ligts or codes?
__________________
Remember proper testing gives us the answer to many problems. MT |
||
|
|
|
|
11-21-2010, 03:19 AM
|
#3 | |
|
AF Regular
Join Date: Mar 2010
Location: atlanta, Georgia
Posts: 247
Thanks: 1
Thanked 8 Times in 8 Posts
|
Re: map sensor failure symptoms
that a V6 or V8? which engine specifically?
i had an 88 suburban with a 350 that had the same symptoms. cyl #1 plug was so fouled that it wouldn't fire. replaced em all and the problem was fixed. Any piston clang or stumbling when you try to punch the accelerator?
__________________
2001 Chevy Blazer 4.3L 5 speed manual Alpine deck, Type R 12in. sub. 145k miles 1997 Pontiac Sunfire 2.2L automatic trans 146k miles |
|
|
|
|
|
11-21-2010, 08:03 PM
|
#4 | ||
|
AF Enthusiast
Join Date: Jun 2006
Location: smalltown, New York
Posts: 606
Thanks: 0
Thanked 25 Times in 24 Posts
|
Re: map sensor failure symptoms
Quote:
Not sure if it pertains to your Blazer or not, but my 93 had terrible fuel economy and once I pulled the plenim off, I saw why. The fuel hoses in there leak pretty generously. Pull the oil dipstick. Does it smell like gas? Is the oil level higher? I'd check these because it is a common problem with our Blazers.
__________________
"When I was a kid my parents moved a lot, but I always found them." Rodney Dangerfield |
||
|
|
|
|
11-21-2010, 08:25 PM
|
#5 | |
|
AF Enthusiast
Join Date: Mar 2008
Location: garner, North Carolina
Posts: 3,579
Thanks: 86
Thanked 100 Times in 100 Posts
|
Re: map sensor failure symptoms
The symptoms of a bad MAP sensor is the same as a Massive Air Flow (MAF) sensor.
A bad MAP sensor, would give a bad signal for the air/fuel mix! deliverability issues, fuel economy, and slow to react to the throttle position sensor. |
|
|
|
|
|
11-21-2010, 09:14 PM
|
#6 | |
|
Registered Offender
 
Join Date: Mar 2006
Location: Rural
Posts: 6,562
Thanks: 8
Thanked 346 Times in 341 Posts
|
Re: map sensor failure symptoms
You can test the MAP with a voltmeter and vacuum pump/gauge. Backprobe the electrical connector for the MAP and turn on the ignition. Connect the vacuum pump and monitor the voltage as the vacuum changes. It should be something close to this:
__________________
Permanent seat assignment on the Group W bench... Automotive Forums Survival Guide |
|
|
|
|
| ||||||||||||||||||||||||||||||||||||||
|
POST REPLY TO THIS THREAD |
| Tags |
| 1991 , blazer , map , sensor |
 |
|
|
