EVAP canister problems

Hi, Roy,

Thanks for your response. The solenoid is working because I can feel it operating. It starts operating about 5-mins after starting from cold. Should it come on at idle or only when driving? Another thing is; once it runs the first cold start and purges and goes off, it turns on again, if I stop the engine and restart it. I feel that it is staying on too long and running too often. Something I did not mention before is that I can't get the EVAP. Nor the catalyst monitor to run no matter how many times I do the drive-cycle. Can this problem also be caused by a bad LDP reed-switch? Is the gas tank EVAP line suppose to be open the purge solenoid when the pump is running? Thanks for your help. Frank.

Well, I had already bought a new purge solenoid but it did not appear to be making any difference. So I reinstalled the old one just to get a comparison. So on your suggestion, I put the new one on again ran the engine and the purge came on: The LT went to negative 25 and back to negative 14. After I stopped the engine and restarted, the trims are now at negative 7. I suppose it is normal for the engine to run rich when the solenoid is purging, but I have never seen it go to negative 25 to 30 before, that is why I decided to ask for some help. There is still a problem, because the EVAP-. Monitor won't run; does that have anything to do with the reed switch Roy? The LT trims have been running negative 10 for months and I figured it was an exhaust manifold leak and/or, the EVAP-system: I think I fixed the exhaust manifold leak but I am not sure about the whole EVAP system. What do you think? Thanks, Frank

I never heard the term bay-test before but if you mean to control components with the scanner then the answer is no. My scanner is the Innova 31603 just a simple one for now. Sorry, Frank. I have a test light, a VOM, vacuum gauge. Collecting tools a little bit at a time Thanks Frank

Okay, but what do you mean by 'clears'?

Thank you. I'll try it tomorrow morning. Frank

Good morning Roy. Well, I ran the engine until warm. The trims were normal at idle negative 7. If I raise the RPM with the purge-valve off the trims improve, while if I raise the RPM with the purge running, the trims go more neg. I took it for a drive and the trims got as neg as 20 at some points. Aren't the trims suppose to stay in the 10% range no matter what the speed is? Thank you, Frank

Yes, but they should also stay in the positive and negative 10% range at all engine speeds and vehicle speeds. Right?