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#1
04-19-2008, 01:51 PM
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fuel economy
was looking through the economy report post and found something about replaceing the cpi unit and fuel lines
now im geting about 9 or 10 mpg on highway i have a 99 4x4 4 door my question is how do i know if this is my problem and how much is it in price and work
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1989 camaro iroc 350 bored .060 over aluminum intake q-jet  unknown big cam 194/150 valves ported and polished automatic /shift kit 93 accord 4 door auto stock 
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#2
04-20-2008, 09:11 PM
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Re: fuel economy
The cpi was used on 95 and older VIN W 4.3's. The regulators and fuel lines were prone to leaking. What you have is a CSFI unit, found on 96+ VIN X and W 4.3's. It looks similar to a cpi but functions differently. They are prone to having leaking or clogged injectors. Any drivability issues? Have you performed a tune up lately (cap, rotor, plugs and wires, fuel filter, air filter)? Have the O2 sensors ever been changed? If its an automatic, has the fluid and filter been changed? If its a 4x4, make sure that it is not stuck in 4wd.
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2000 Chevy Blazer ZR2 Performance Mods: Numerous Suspension Mods: Some, but not enough Exterior Mods: Just Right 1987 Buick Turbo T Dark Red Low 11 sec sleeper  .030 4.1 block, PT6262E, & other odds and ends.... My Cardomain
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#3
04-21-2008, 08:29 AM
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Re: fuel economy
did a plugs wires cap rotor air filter fuel about 300 miles ago
it dose have a slight hesitation on hard exceleration sometimes it will even pop through the intake other wise it drives good also did a fueel pump about 5 months ago its is an automatic it is not stuck in 4wd the trans fluid was changed about 20,000 miles ago along with a shift solinoied dont remember witch one but it dose shift good all the way to over drive
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1989 camaro iroc 350 bored .060 over aluminum intake q-jet unknown big cam 194/150 valves ported and polished automatic /shift kit 93 accord 4 door auto stock
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#4
04-21-2008, 05:55 PM
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Re: fuel economy
Checking fuel pressure and leakdown rate will tell if you have any problems with fuel delivery to the injector. Ignition on, engine off, fuel pump running, pressure must be 60psi to 66psi. Must remain above 55psi for 3 to 5 minutes after the pump shuts off.
If leak down remains above 55psi, the injector, "nut Kit" (lines in the plenum), the fuel pressure regulator, the lines from the pump, and the check valve in the fuel pump are all ok.
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