ip advice

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Apr 4, 2014 | 09:02 PM

kla94

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Joined: Jul 2012

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From: Centerville TN

ip advice

I recently had air intrusion issues. Installed a carrier e-pump and bypassed my fuel selector valve. Since I done this my truck has been sluggish on take-off and black smoking on take-off. Got my ferret out today and timed it. I had to REALLY retard the ip to get it to 7 degrees. It idles great and runs smooth with a light haze of smoke at wot. It doesn't want to start without some cranking though. It started much easier before I timed it but it was a smokey pig. I timed it at 7-7.5 when I replaced my ip and injectors a little over a year ago. Only put around 18,000 miles on it since then. Could the carrier be putting just a little too much fuel pressure on the ip causing timing issues?

Apr 4, 2014 | 10:09 PM

Red454sedgwick

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Yes too much or too little fuel pressure messes with the timing, get a regulator and a gauge for it. you'll be impressed

Apr 5, 2014 | 01:33 AM

speedwrench72

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Joined: Dec 2012

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From: western washington

on stock ip's they don't like to much pressure, put your timing meter on it and crimp the fuel line and watch the timing move.

Apr 5, 2014 | 11:40 PM

Macrobb

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As far as I can tell, the most important thing is that the fuel pressure is /consistent/.
Whether your incoming pressure is 0 -- as in gravity fed -- or 8PSI, it should be fine... but it can't be varying if you expect good timing.
Also if it's *too* high, you may overpressure the thing, but I doubt you'll be able to do that with a normal pump.

Either way, though, after changing your fuel system pressures(or anything that could affect the pressures), you want to re-time it.

Apr 6, 2014 | 07:03 AM