msmack Posted December 17, 2015 Share Posted December 17, 2015 Hi I have a 2001 Etech 470, something strange happening with the boost pressure and power. I havent seen the boost gauge go over 150kpa for a few months truck felt a bit like it had lost some power but I thought must be my imagination then last week going uphill the truck made a completly different sound and took off up the hill like a rocket looked at the boost gauge it was reading 225kpa since then it has been up and down noticeable sound difference and gauge pressure when its going well. not showing any fault codes, the mechanic had a look changed 2 hoses on the intercooler and a sensor also sometimes the tacho will go up fast and sometimes slow on the same road in the same place sort of feels like driving into a headwind or soft ground if anyone has any ideas what could be happening that would be great thanks Quote Link to comment https://www.bigmacktrucks.com/topic/43157-power-and-boost-issues/ Share on other sites More sharing options...
gearhead204 Posted December 17, 2015 Share Posted December 17, 2015 is that an egr engine? if so sounds like a sticky egr valve and is stealing your boost from the turbo, if a non egr engine I would check the turbo sounds like a variable vane actuator issue Quote Link to comment https://www.bigmacktrucks.com/topic/43157-power-and-boost-issues/#findComment-316195 Share on other sites More sharing options...
msmack Posted December 18, 2015 Author Share Posted December 18, 2015 I don't think it's an egr engine do you know if I can check the turbo or it needs a mechanic thanks for your replySent from my iPhone using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/43157-power-and-boost-issues/#findComment-316323 Share on other sites More sharing options...
Challenger Posted December 20, 2015 Share Posted December 20, 2015 2001 Etech do not have an EGR. EGR came out in 2003 with the ASET AC engines. Maybe you are having some kind of fuel pressure problem. If you have low fuel pressure, you will have low boost pressure. No fuel pressure, no boost pressure. You can add a pressure gauge to the fuel system and ran the truck, monitor the pressure while the truck is acting up. I use a air pressure gauge( like the one the truck uses for air pressure). I remove the plug thats towards the right front of the engine, just in front of the EUPs (its the 1/4"square plug), add a fitting and 1/4" airline and the gauge. Run the 1/4" into the cab, be careful around the exhaust. This is a temporary gauge for diagnostics purposes. Quote Link to comment https://www.bigmacktrucks.com/topic/43157-power-and-boost-issues/#findComment-316610 Share on other sites More sharing options...
masterwelder Posted February 23, 2016 Share Posted February 23, 2016 What Range should the fuel pressure be in? I have a 2001 350 Etech that I just got put together and it feel sluggish to me. The most boost I have seen so far has been 25psi with a load. I just did a complete service, oil and all filters. Going to check for more boost leaks, found one so far in the hose at the air compressor. Quote Link to comment https://www.bigmacktrucks.com/topic/43157-power-and-boost-issues/#findComment-325471 Share on other sites More sharing options...
TRH Posted March 5, 2016 Share Posted March 5, 2016 80-100 psi off the top of my head. Could also be injectors or a lot of other things causing underfueling which would result in a lack of boost. Any smoke? Codes? Sent from my iPhone using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/43157-power-and-boost-issues/#findComment-326565 Share on other sites More sharing options...
mrgumby Posted March 5, 2016 Share Posted March 5, 2016 also if it has vtg it could be the vtg controller Quote Link to comment https://www.bigmacktrucks.com/topic/43157-power-and-boost-issues/#findComment-326629 Share on other sites More sharing options...
Jamkar Posted March 6, 2016 Share Posted March 6, 2016 I had an etech that did the same sorta thing. When it got lazy I'd stab the loud pedal a couple of times and off we'd go. I thought it was a computer setting type thing. Quote Link to comment https://www.bigmacktrucks.com/topic/43157-power-and-boost-issues/#findComment-326716 Share on other sites More sharing options...
TimberJack Posted March 8, 2016 Share Posted March 8, 2016 I have a 2004 ch doing the same thing. Sent mine to the dealer spent $7500 and no change. Was going to check fuel pressure but the plug was stripped on the front so I used the one on the back and at idle it's only reading 10 lbs, ran it up to 1800 rpm and only reading 42. Quote Link to comment https://www.bigmacktrucks.com/topic/43157-power-and-boost-issues/#findComment-326911 Share on other sites More sharing options...
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