Check the hose clips for tightness and inspect the trunking for any cracks or splits and also all the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best way to find a leak is to have the engine handing out and warm and then vaporizer lighter gas /propane or brake cleaner nearly each joint in turn. If the engine rev s going on you ve found your leak.
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Its plus worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a ill pump will all result in insufficient fuel being delivered to the engine. Might with be worth cleaning out the idle promptness rule motor / valve as these get clogged in the works like carbon and some brake cleaner washed through helps pardon things off.
Hello the TPS does have an effect upon switching the car into idle mode therefore I'd recommend to make positive the throttle dish is 100% closed and not slightly grounded considering carbon. and subsequently get used to the TPS appropriately that the IDL fix is continuous to the E2 stick with the throttle is closed, and admission circuit as soon as the throttle is just cracked. Don't bother nearly any voltages, the IDL contact is the essentially important one.
Picture Schematics for 2005 buick lesabre wiring diagram
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