QCDriver Posted August 30, 2009 Share Posted August 30, 2009 Thanks in advance for your help.My engine is missing off idle,(like loading up)and puffs blue every now and then.My mpg is the same and power is still there. It does not throw any fault codes as of yet.I have 400k on the engine now, where is the first place you would check?Thanks, Doug Quote Link to comment https://www.bigmacktrucks.com/topic/10490-01-e7-missing-low-rpms/ Share on other sites More sharing options...
fjh Posted August 30, 2009 Share Posted August 30, 2009 Thanks in advance for your help.My engine is missing off idle,(like loading up)and puffs blue every now and then.My mpg is the same and power is still there. It does not throw any fault codes as of yet.I have 400k on the engine now, where is the first place you would check?ThanksDoug I would check fuel preasure first you need to have 60 psi or better at the block! a fairly common comon failure is the fuel transfer pump. Quote Link to comment https://www.bigmacktrucks.com/topic/10490-01-e7-missing-low-rpms/#findComment-39752 Share on other sites More sharing options...
QCDriver Posted September 1, 2009 Author Share Posted September 1, 2009 (edited) Thanks in advance for your help.My engine is missing off idle,(like loading up)and puffs blue every now and then.My mpg is the same and power is still there. It does not throw any fault codes as of yet.I have 400k on the engine now, where is the first place you would check?ThanksDoug I would check fuel preasure first you need to have 60 psi or better at the block! a fairly common comon failure is the fuel transfer pump.I'll check that out next week. Also it's fine in the morning before at temp. The hotter the outside temp is, the more it misses. Put foot to floor flattens right out.?.? If I stay above 1000rpm all is fine. Edited September 1, 2009 by QCDriver Quote Link to comment https://www.bigmacktrucks.com/topic/10490-01-e7-missing-low-rpms/#findComment-39800 Share on other sites More sharing options...
theakerstwo Posted September 6, 2009 Share Posted September 6, 2009 fjh tell me what the fuel pressure should be on a 91 year Vmac.My service manual on a E7 dont got that info in it. thanks Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/10490-01-e7-missing-low-rpms/#findComment-40003 Share on other sites More sharing options...
fjh Posted September 6, 2009 Share Posted September 6, 2009 fjh tell me what the fuel pressure should be on a 91 year Vmac.My service manual on a E7 dont got that info in it. thanksGlen yours will run fine with 15 psi or more even under load ,should be around 20-25 spec wise thou. Quote Link to comment https://www.bigmacktrucks.com/topic/10490-01-e7-missing-low-rpms/#findComment-40012 Share on other sites More sharing options...
QCDriver Posted October 13, 2009 Author Share Posted October 13, 2009 Thanks everyone for replies. I had to wait awhile to fix had wrist surgery, any how. I thought if I could push primer in while enginewas running it had to have low pressure. I installed new supply pump and runs much better now, no blue smoke puffs. Still was a very slightmiss. Also I can not push primer in while running. Thanks again. Quote Link to comment https://www.bigmacktrucks.com/topic/10490-01-e7-missing-low-rpms/#findComment-41886 Share on other sites More sharing options...
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