Re: Weird idle - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: Weird idle
Posted by Dean [Email] (more from Dean) on Thu, 7 Jun 2007 11:47:53
In Reply to: Weird idle, Stephanie, Thu, 7 Jun 2007 10:31:14
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What does the gauge show when the ignition is on and you have not yet started the engine? If it shows at the border of green-yellow, then its probably working ok. In that case, check the VAC line from the TB to the MAP sensor (manifold absolute pressure sensor) that is mounted to the underside of the black right hand tower brace tube\ about 10-12 inches away.
If the guage is dead with ignition before start, that is an electrical problem.
If the VAC line is damaged or the sensor or wires from there to the ECU are bad I would exect very poor running.
Also check the VAC line from the TB to the FPR.
Correct plugs?
Gapped correctly?
Plugs fouled? -might be from the prior problem
Used Techron Concentrate lately? Will clean injectors, intake valve and combustion chambers.
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