Spawne32

iTrader: (3)

Hey guys, trying to diagnose a problem here, i just failed NJ inspection again because as i was sitting in a line of traffic at the inspection station my afr gradually climbed to about 16-16.5:1 and the engine started missing. I noticed that my fuel pressure had dropped from 43.5 which i had set it too at operating temp, and idling at 775 (where i have it set to) to about 39psi. If you romp on the gas a couple times, pressure slowly increases, until you are back where you need to be.

I have a walbro 255 (non hp) fuel pump that i just installed a few months ago, fuel filter was replaced a year ago, AEM fpr regulator rising on a 1:1 ratio with boost, and bosch type2 420cc injectors.

Ive never heard of these cars having an issue with factory wiring being insufficient, i can only assume either a clog, or voltage drop at the pump seeing as the pump is new, but i cant imagine what the cause would be.

1997civicdx

Whats your charge voltage at idle? after idling for a while with whatever accesories on that you were running at the time.
Probably easiest to start there then get into checking voltage at the pump itself.

Spawne32

iTrader: (3)

13.9-14.3, alt is brand spankin new from maniac electric motors

thewrai6th

I've had two Walbro HP's go bad. I would not rule that out. One of them started pumping weak and soon after died. The other just stopped pumping while I was driving down the freeway.

civickiller

why did u fail? sorry we dont have any inspections like that here

Spawne32

iTrader: (3)

high hydrocarbons, the higher it gets in the afr's the more it starts to misfire, hydrocarbons indicates that there is unburnt fuel in the exhaust

ricin4ever

iTrader: (1)

U mean emissions right? Inspection is safety only

Spawne32

iTrader: (3)

inspection is only emissions here in nj, its still called nj state inspection