Re: Hesitation issue. Need help ! - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: Hesitation issue. Need help !
Posted by Dean (more from Dean) on Wed, 7 Feb 2001 11:34:14
In Reply to: Hesitation issue. Need help !, Bruce, Wed, 7 Feb 2001 11:23:49
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Pull the plugs and see how they look, check gaps, replace if any doubt.
Have you been using injector or fuel system cleaner? Injectors could be fouled and have poor spray patterns at low flow delivery rates. Did plugs have uneven color? That indicates uneven fueling which can be created by fouled injectors. Techron Concentrate is very effective.
A vacuum leak can throw off the mixture at low throttle, but the leak becomes insignificant at higher throttle. This would be true if you have an air mass meter. Speed density systems would just idle fast. Check for split vacuum hoses, especially where they are fitted onto the hose barbs. Also, a busted diaphragm in an actuator or bypass valve could be checked for.
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