All of this advice is excellant. What I want to add is that the CPR either gets blocked up with dirt, gets hooked up incorrectly, the hoses leak or get knocked loose, and the wiring inside can burn up. You can disassemble it to inspect the wiring. It can be repaired but you are better off just exchanging it for a rebuilt. Make sure the hoses are hooked up EXACTLY as they should be and be sure they are not cracked, loose, or leaking. You don't want to replace a good CPR just because a vacuum hose was not on tight! A fuel pressure tester is nice but not required. There are other ways to diagnose the fuel system. The pressure tester is good on a car that never ran right or has weird symptoms. If the car runs good once it warms up you can rule out most things. Generally if you have problems during the warm-up cycle it will turn out to be the CPR or the vacuum hoses going to it. David Teitelbaum vin 10757 --- In dmcnews@xxxxxxxxxxxxxxx, "Dave Sontos" <dsontos@...> wrote: > It is normal for the dwell to swing like that. That means your computer is > working and receiving a signal from the O2 sensor. Mine will swing about > 10-15 degrees. Make sure the car is warmed up (fans cycle on/off), set the > dwell and then replug the hole and watch the dwell. Your goal is a average > reading of 40-45 degrees. I'm trying to remember but I think a higher dwell > reading will result in a leaner mixture and then result in harder starting > but better performance off the line. A lower dwell reading will be r To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/