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04 Aug 2004, 06:15 pm
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Leak Detection Pump
Turns out that my check engine light was because of a faulty leak detection pump. I have never even heard of this whatever it is. What is it exactly? The dealer said that they didn't have one in the warehouse, and that I would be OK driving it around until the part comes in. What do ya'll think? I really have no idea what a leak detection pump is, so if somebody can clue me in, I'd be grateful.
    
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04 Aug 2004, 06:33 pm
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Well, he wasn't lying. I just looked it up in my parts manual. It's right there next to the Vapor Canister and listed in the Emission Systems section.
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  ...just CREWZIN along! ® . . . PT Cruiser Links Moderator  2000 PT. 100,000 miles, Original Owner Visit My Home Page www.CREWZIN.com
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04 Aug 2004, 06:35 pm
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"Faulty Leak Detection Pump" LOL. Your probably reading the machanics chicken scratch. [
 ]LOL[] Possibly translates to Fault: Leak detection in pump circuit. It could be something in the fuel system, since its pressurized. Did they list the Fault Code?
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2004 Graphite Metallic GT, S1, 17\" Rage Motif Wheels, Falken Zeix ZE512 Tires, AIRAID Intake, MAXXFAB downpipe, BTG Rear Springs 1.5 drop, MAXSPEED Front Springs 1.4 drop, BLITZ FATT DC3 TT, Autometer UL Boost Gauge, BEL RX65 Radar. Next Mod: Up Pipe.
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04 Aug 2004, 07:19 pm
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NO T, I wasn't joking. "PUMP, Leak Detection" Chrysler Part Number 4891 420AA. Part of the Emission Systems.
__________________
...just CREWZIN along! ® . . . PT Cruiser Links Moderator 2000 PT. 100,000 miles, Original Owner Visit My Home Page www.CREWZIN.com
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04 Aug 2004, 07:44 pm
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Sweet, so it's an actual part, now, any ideas on what it does?
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04 Aug 2004, 07:57 pm
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The LDP is a small air pump. It pressurizes the EVAP & fuel system to make sure there are no leaks. This ensures that no harmfull vapors are escaping to the atmosphere.
So.... it's a pump... and it is used by the PCM to detect leaks...... hence the name Leak Detection Pump. The whole system is only pressurized to about .5psi, so it's a very small pump. There's no big surprize that it failed. It has moving parts, electricity passing through it, and it's soaked in 200F+ engine heat. That makes it the most likely to crap out early.
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04 Aug 2004, 09:33 pm
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MX-5, I sure like your concise comments, with the added humor.
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04 Aug 2004, 09:43 pm
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Thanks MX-5, I was hoping you'd chime in. Thanks for everyone elses help too.
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05 Aug 2004, 07:47 am
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Sounds like you could replace it by blowing thru a straw...
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05 Aug 2004, 09:46 am
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Quote:
I have a special pump for diagnosing turbo and supercharger boost issues, but it's not very accurate at only .5psi. A straw is much more controllable. (The Toyota had a faulty vapor management valve switch and disintigrating charcoal canister.)
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