gramazone Posted May 2, 2014 Share Posted May 2, 2014 having a low boost issues on my mack truck,,revs clean but only goes to 15/18 lbs of boost under load..very low on hp lately,,plus my speedo says arou d 25mph while im doin 55mph Quote Link to comment Share on other sites More sharing options...
gearhead204 Posted May 2, 2014 Share Posted May 2, 2014 check all coupling boots for tears also pressure test the charge air cooler ( there famous for cracking on the ends) Quote Link to comment Share on other sites More sharing options...
gramazone Posted May 2, 2014 Author Share Posted May 2, 2014 thanks..ill take a closer look Quote Link to comment Share on other sites More sharing options...
Mackpro Posted May 2, 2014 Share Posted May 2, 2014 According to the Mack tune up manual, you should be getting 24-32 psi. also check your intake manifold gaskets and the air compressor intake piping over to the intake manifold. Quote Link to comment Share on other sites More sharing options...
felicello122 Posted May 4, 2014 Share Posted May 4, 2014 That little hose on the air compressor running over to the intake via pipe or hose screw up often like mackpro said. Quote Link to comment Share on other sites More sharing options...
gramazone Posted May 15, 2014 Author Share Posted May 15, 2014 thanks guys,,i took the truck to the big island and a guy hooked up the diagnostic machine on it,,a 142 code came up..saying failure for ECU to comunicate with pump...cant see hows that posisble and the truck working fine except for the low boost..im goin to check that hose above the compressor and clean up the harness at the injector pump and on the firewall...wish me luck Quote Link to comment Share on other sites More sharing options...
gramazone Posted June 24, 2014 Author Share Posted June 24, 2014 now im having an eradic idle..the idle goes up and down 200 to 300 rpm,,while just idling...im still low on boost...has anyone had issues with the male n female round plug for the injector pump on the E-7 Quote Link to comment Share on other sites More sharing options...
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