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EGR BPT Valve? Forums > > EGR BPT Valve? EGR BPT Valve?
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Frontier Nissan Frontier/HB/Truck Discussion Forum

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  #1  
Old 02-11-2017, 10:30 AM
x0a x0a is offline
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2000 Frontier
 
Join Date: Feb 2017
Posts: 2
Default EGR BPT Valve?

I've got a P0400 check engine light on my 2000 Frontier.

I've done the following:
  • replaced EGR valve, because the rubber diaphragm was chock full of carbon
  • replaced a bunch of vacuum hoses because they were also clogged with carbon
  • removed and cleaned the throttle because the vacuum orifice was impossibly clogged with carbon
  • verified that the EGRC solenoid was working using multimeter and car battery

However, after all that, the EGR valve still wasn't opening when it was supposed to. So I checked for vacuum and verified that vacuum worked all the way up to the hose for the EGRC BPT valve. Then, mysteriously, I get positive pressure FROM the EGRC BPT valve. So exhaust gasses are leaking from the EGRC BPT valve into the vacuum system.

Is this normal behavior? If not, how do I fix it without replacing it? It's a bit expensive for a plastic part. I think it might explain why my system was so full of carbon.

Last edited by x0a; 02-11-2017 at 03:19 PM. Reason: spelling
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  #2  
Old 02-11-2017, 03:17 PM
x0a x0a is offline
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2000 Frontier
 
Join Date: Feb 2017
Posts: 2
Default

Turns out my EGRC BPT valve was bad. Posting some documentation in case anyone else faces the same issue.

I applied 30 PSI of pressure to the bottom port per the service manual, and saw gasses escape through the vacuum ports. Definitely not correct behavior



Taking apart the valve I found the little rubber diaphragm brittle and torn to shreds, and the spring broken from rust. The exhaust gasses leaked to the vacuum system and clogged everything on the way.



I temporarily fixed my problem by bypassing the EGRC-BPT valve and hooking the solenoid straight to the EGR valve. No more hesitation on take off
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  #3  
Old 02-12-2017, 12:20 AM
JRJoe JRJoe is offline
Tech Enthusiast
2013 Frontier King Cab
1993 Truck
 
Join Date: Sep 2013
Posts: 172
Default Good Job

Thanks for posting the How To Verify and Fix with picture's.

Won't be long till your's will be 20 year's old.

Regard's
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2013 SVV6 KC AT 2WD Frontier, '93 4Cyl, AT, KC Hardbody(20yrs Orig Owner-Sold 174K mi.)
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