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2001 pontiac grand se 2.4 map sensor question.

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5 years 5 months ago - 5 years 5 months ago #24751 by BeavisButthead
2001 pontiac grand se 2.4 map sensor question. was created by BeavisButthead
hello i have a 2001 grand am s 2.4 with a bad idle . and was wondering if it could be my map sensor cause it is reading 9.4 at normal oppertaing temp . my idle jumps between 524 to 700 and i rough .
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Last edit: 5 years 5 months ago by BeavisButthead.

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5 years 5 months ago #24754 by BeavisButthead
Replied by BeavisButthead on topic 2001 pontiac grand se 2.4 map sensor question.
Here is a video I just made with my scan tool showing it's reading .

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5 years 5 months ago - 5 years 5 months ago #24759 by juergen.scholl
Replied by juergen.scholl on topic 2001 pontiac grand se 2.4 map sensor question.
Your MAP reading is fine, the scanner displays the actual pressure in the manifold, just as its name indicates...

.If you were at sea level the engine is pulling close to 20 inches of vacuum. These 2 number add to almost 30 inches of mercury which is atmospheric pressure.
An expert is someone who knows each time more on each time less, until he finally knows absolutely everything about absolutely nothing.
Last edit: 5 years 5 months ago by juergen.scholl.
The following user(s) said Thank You: Noah

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5 years 5 months ago #24769 by BeavisButthead
Replied by BeavisButthead on topic 2001 pontiac grand se 2.4 map sensor question.
im close to sea level im in california . so if its not my map sensor then whats causing my rough idle ?
ive checked all vacuum lines including map line. ive checked head gasket / iac ( unplug and nothing change at op temp ) .
is there a idle screw on the throttle body ?

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5 years 5 months ago #24787 by Tutti57
Replied by Tutti57 on topic Re:2001 pontiac grand se 2.4 map sensor question.
What is your long term fuel trim reading at idle?

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5 years 5 months ago #24796 by Andy.MacFadyen
Replied by Andy.MacFadyen on topic 2001 pontiac grand se 2.4 map sensor question.
The traditional name for this uneven idle speed is "hunting" usually it is sign of a lean fiel-air ratio. Try a water spray test to look for a vacuum leak I would post a link to a video but I am on a very slow connection at the moment. The other thing to do is clean the throttle body, I know you already tried disconnecting the IAC but it would do no harm to clean it. The other thing that can cause low rpm surging is a sticking EGR if your car has an EGR and if the above give no improvement clean and check the EGR
" We're trying to plug a hole in the universe, what are you doing ?. "
(Walter Bishop Fringe TV show)

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5 years 5 months ago #24889 by BeavisButthead
Replied by BeavisButthead on topic Re:2001 pontiac grand se 2.4 map sensor question.
Ok so here is the fuel trim

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5 years 5 months ago #24890 by BeavisButthead
Replied by BeavisButthead on topic 2001 pontiac grand se 2.4 map sensor question.
Andy the 2.4 grand am don't have a EGR .

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5 years 5 months ago #24930 by BeavisButthead
Replied by BeavisButthead on topic 2001 pontiac grand se 2.4 map sensor question.
Ok so I believe there is no vacuum leaks . Took the gardening hose well engine is running and soaked every thing ( did have a spray bottle or a dollar ) . The idlea did not change one bit .

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5 years 5 months ago #24942 by BeavisButthead
Replied by BeavisButthead on topic 2001 pontiac grand se 2.4 map sensor question.
Any one have a idea ?

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5 years 5 months ago #24948 by juergen.scholl
Replied by juergen.scholl on topic 2001 pontiac grand se 2.4 map sensor question.

BeavisButthead wrote: Any one have a idea ?


At this point it could be a variety of things that cause your failure...

Using a logical approach will help you. Instead of telling you it might be a vlalve problem, look at the evap purge valve etc etc
I suggest to check the mechanical condition of the engine. Compression and leak down tests are ALWAYS good starting points.
Thiswill rule out certain possibilities or pin point you into aspecific direction.
An expert is someone who knows each time more on each time less, until he finally knows absolutely everything about absolutely nothing.

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5 years 5 months ago #24960 by BeavisButthead
Replied by BeavisButthead on topic 2001 pontiac grand se 2.4 map sensor question.
Ok so I went on a hour long drive to and got a cell light .

P0442 OBD-II Trouble Code
Emission Control System Leak Detected (small leak)

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5 years 5 months ago #24962 by BeavisButthead
Replied by BeavisButthead on topic 2001 pontiac grand se 2.4 map sensor question.
I don't know if this will help any one but here's another video of some sensor's

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5 years 5 months ago #24996 by Desmond6004
Replied by Desmond6004 on topic 2001 pontiac grand se 2.4 map sensor question.
Remove the spark plugs and post a picture of them - that will give some clues.
Getting involved in discussions because I have a lot to learn still.

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5 years 5 months ago #25091 by BeavisButthead
Replied by BeavisButthead on topic 2001 pontiac grand se 2.4 map sensor question.
Couldn't take a photo but there still purty clean except a little soot after 1500 miles .

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5 years 5 months ago #25097 by Desmond6004
Replied by Desmond6004 on topic 2001 pontiac grand se 2.4 map sensor question.
If they're all even that's still a clue - that it's a "global" problem ie: not a single coil or injector or valve fault - something affecting all of them.
Getting involved in discussions because I have a lot to learn still.

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5 years 5 months ago - 5 years 5 months ago #25105 by BeavisButthead
Replied by BeavisButthead on topic 2001 pontiac grand se 2.4 map sensor question.
so your saying because there burning even and having a light gray like there suppose to with a light carbon on the tip that there there is something wrong with it manically ?

if you think its something then what ? why am i getting a p0442 even with a new cap ?
Last edit: 5 years 5 months ago by BeavisButthead.

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5 years 5 months ago #25107 by Desmond6004
Replied by Desmond6004 on topic 2001 pontiac grand se 2.4 map sensor question.
No, by "global problem" I mean not an individual cylinder. The P0442 is most likely a problem with your evap system - there's more places than the cap that could be leaking.
Getting involved in discussions because I have a lot to learn still.

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