Question about 1990 Pontiac LeMans

2 Answers

1990 Pontiac Lemans choke plate location

During acceleration, my lemans sputters and bucks. I believe it could my choke plate, but don't know where it's located and not too sure how to check it.

Posted by on

2 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    Scholar:

    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 103 Answers

I'm venturing to guess that a 1990 lemans is fuel injected. then you wouldn't have a choke plate. I would start by checking the iginition system first, plugs, wires, cap, rotor, and if all that looks good then look at the fuel system.

Posted on Jan 10, 2009

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

The two studs that sandwich the throttle body together are well known to loosen on these cars. Then the gasket joining the two halves fails and begins to **** air. The car sputters and bucks as the ECM tries to correct and adjust the fuel mixture and spark timing. This is most evident up steep hills.

Remove the air cleaner and filter and then separate the alloy throttle body halves. Either clean the existing gasket and use gasket shellac to put the two halves together or, better yet, use a new gasket. However the last time I checked Pontiac sold a rebuild kit ONLY . . . the gasket was not sold as a separate item. That kit was rather expensive.

I have always separated the body and applied form-a-gasket shellac to the gasket. A key point is to use red loctite when threading in the studs (if loose) back onto the lower throttle body housing or when torquing the nuts on the suds to squeeze the throttle body together as one. Red loctite has never let the two halves separate and leak air after the repair. My car did, perhaps, 250,000 km after the repair with no issues. All others I fixed also solved the poor driving and hesitation problem.

Andrew P. -with two Lotus Esprits

Posted on Mar 22, 2010

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Alternator wiring bad


A new harness is about $30 at http://www.partsgeek.com/catalog/1993/pontiac/lemans/engine_electrical/engine_wiring_harness.html Instructions for replacement are here: http://www.partsgeek.com/assets/perf/full/1236642.pdf

Aug 06, 2012 | 1990 Pontiac LeMans

1 Answer

Injector 1990 Pontiac LeMans issues


I think what you have is just a failed fuel injection fuel pump, the pump is located inside the fuel tank and the fuel tank must be removed to access and replace the pump assembly.

Feb 13, 2012 | 1990 Pontiac LeMans

1 Answer

Where is the cooling fan relay located on a 1989 Pontiac Lemans?


fan relay is mounted on the fuse box under the dash on the drivers side

Jul 08, 2010 | 1989 Pontiac LeMans

1 Answer

Where is the location of the fuel filter on a 1991 Pontiac LeMans LE ?


Most GM cars the fuel filter is located under the car by the left rear wheel. Be sure you wait at least a half hour after running the car to remove the filter, the system retains pressure for a while.

Feb 09, 2010 | 1991 Pontiac LeMans

1 Answer

I NEED THE COMPUTER FOR MY PONTIAC LEMANS 1988, PLEASE HELP ME TO FIND IT.THANK YOUR RAFAEL CASTILLO


im not too sure what your asking but if your wanting the location of the computer its under the bonnet on the top of the firewall just that square box.

Jan 18, 2010 | 1988 Pontiac LeMans

1 Answer

Need to find the starter relay for 90 pontiac lemans


possibly under hood with some other fuses

Nov 09, 2009 | 1990 Pontiac LeMans

2 Answers

Fuel pump location 1976 pontiac grand lemans


Is on the side of the engine here is how it looks like
f47999c.jpg

Jun 28, 2009 | 1990 Pontiac LeMans

Not finding what you are looking for?
1990 Pontiac LeMans Logo

164 people viewed this question

Ask a Question

Usually answered in minutes!

Top Pontiac Experts

yadayada
yadayada

Level 3 Expert

61037 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6812 Answers

Are you a Pontiac Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...