I found this message draft that I was putting together after I had power problems with my car December 2002. The power would drop off above 4000 RPM. I played around with shim thicknesses but I think that I may have just flushed a piece of debris from the fuel system. The car starts and runs strong now and pulls up to redline. Perhaps this Winter I will get a chance to fool around with it some more. Scott Below is the test readings I took while trouble shooting. The injectors are new and were installed during my major tune-up last spring (2002). I increased the shim thickness and the new readings are; 1.7 Control Cold 50 F 5.4 Primary 3.0 Rest 2.0 Control Cold 70F ambient temperature 5.4 Primary Cold 3.0 Rest Cold 3.5 Control Hot engine warmed up 5.4 Primary Hot 3.2 Rest Hot Original Shim 2.0 Control 4.9 Primary 2.9 Rest Timing 13@Hot Idle 32@4000 RPM Total The car runs fine now. I'm not sure if it was the increase in pressure or if I flushed some piece of trash out to the distributor. Scott Mueller 002981 RNDOLA -----Original Message----- From: dherv10@xxxxxxx [mailto:dherv10@xxxxxxx] Sent: Wednesday, December 04, 2002 10:49 PM To: dmcnews@xxxxxxxxxxxxxxx Subject: Re: [DML] No power at 4000 RPM Scott, See below. John Hervey << Recently I posted a message asking for ideas on what could be causing the drop in power at full throttle once the engine started going past 4000 rpm. I installed a gauge to measure fuel system pressures. All reading were taken on a cold engine, 70 F ambient temperature. ( what are your readings hot.) Control Pressure = 2 bar Primary Pressure = 4.9 bar Rest Pressure = 2.9 bar Rest Pressure after 10 minutes = 2.5 bar Looking at my chart, it looks like primary pressure is at the bottom end of the allowable checking pressure 4.9 to 5.5 bar. I can set the primary pressure to the setting range of 5.1 to 5.3 bar. My question is; Will raising the primary pressure affect the Control Pressure? ( Yes ). Is there a way to adjust the Control Pressure?( Yes, But by the experts. ) How is it done? >> ( Take the fuel dist off and send it to me. ) The fuel pump doesn't create the pressure, all it does is pump volume of gas. The restrictions create the pressure. The primary pressure can only be adjusted by a shim in the unit. ( Picture on my web site.) When it's right ( Yes ) it also creates a back pressure ( trying to keep the gas from going back to the tank) which will raise or lower the control pressure which in turn will allow the control plunger to up or down sending gas to the injectors. Speaking of injectors, Have they been cleaned or replaced. You may be starving the car gas at high RPM because the injectors are partially stopped up. John Hervey www.specialTauto.com Yahoo! Groups Sponsor <http://rd.yahoo.com/M=259395.3614674.4902533.1261774/D=egroupweb/S=170512 6215:HM/A=1524963/R=0/SIG=12o885gmo/*http://hits.411web.com/cgi-bin/autore dir?camp=556&lineid=3614674?=egroupweb&pos=HM> <http://us.adserver.yahoo.com/l?M=259395.3614674.4902533.1261774/D=egroupm ail/S=:HM/A=1524963/rand=733661369> To unsubscribe from this group, send an email to: DMCForum-unsubscribe@xxxxxxxxxxxxxxx Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service <http://docs.yahoo.com/info/terms/> .
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