Quote:
Originally Posted by lmmr74
The only modifications i did, was removing the stock air filter by a cone filter, directly attached to the MAF.
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A futile practice which is most likely costing you power and mileage.
http://www.toyota-supra.info/forums/...ggestions.html
Quote:
Originally Posted by lmmr74
One other thing i forgot to mention was that when i shut down the engine there was a strang noise coming from the charcoal cannister.
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It's possible that the charcoal canister isn't functioning properly anymore. It charcoal may not be absorbing the fuel fumes and regulating their release into the system at an appropriate rate. You can try disconnecting the vacuum tube temorarily and plugging the vacuum nipple where it runs on the intake to see if that helps. If it does help you should also inspect the bi-metal vsv which is supposed to be in the middle of the vacuum line from the charcoal canister to the throttle body. If the charcoal canister is bad you can usually get one that's still good from a newer model Toyota at a salvage yard for all of $5 to $15. I am not in favor of deleting the system and just letting your gas evaporate.... the stuff costs a good amount and I intend on using every drop I spend cash on.
Quote:
Originally Posted by lmmr74
Is it normal to be hard to start an hot engine?
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No, it's not normal at all.
Other possible causes include:
Heat soaking air flow meter
Bad ECU coolant temp sensor
Ignition timing not set properly
Fuel pressure bleeding off too quickly once the engine is stopped
Bad cold start injector time switch
Leaking injector
Oil in spark plug galley (will cause a power loss across the board but will be most noticeable at low RPM and when starting the car)
Refer to the Toyota Service and Repair Manual for testing and repair information on all of these systems/parts:
http://www.cygnusx1.net/Supra/Library/TSRM/MK3/