Carburetor trouble – HELP PLEASE!

[rworkman98]

I just took the carburetor out of my truck, cleaned it and changed the seals. I also checked the Dry Float Level, Float Drop, Vacuum Break, Secondary Throttle, Fistle Idle, and Unloader Adjustments. I slightly changed the Dry Float Level and Fast Idle Adjustments to put them within specs. The others were already w/in spec. However, when I put it back on the truck, I now have a major new problem that I didn’t have before. The engine idles fine now, but stumbles and dies any time I bring the RPM past about 2500. I’m not sure what I could’ve done that caused this. Please Help me!

The truck is a 1982 Datsun 720 Pickup. The carburetor is a Hitachi Model DCR 342. Here is a blowup of the carburetor, showing all parts and part labels. http://www.geocities.com/rworkman98@sbc ... t/carb.htm

Modified by rworkman98 at 8:17 AM 6/8/2007
Modified by rworkman98 at 12:51 PM 6/13/2007

[Ch3es3Pl3as3]

check out this guys site, lots of useful info http://groups.msn.com/NissanDa....msnw

[NissanMaster]

HI,IF YOUR ENGINE HAS THE 8 PLUGS SETUP I WOULD CHECK THE DISTRIBUTOR CAP & ROTOR,THEY BURN INTERNALLY & ARC, AT 2500 RPM IS WHEN THE 1 COIL SWITCHES TO THE OTHER COIL & CAUSES THE CHUG/LOSS OF POWER SCENERIO.THE OTHER POSSIBILITY IS THE FUEL PUMP MODULE BEHIND THE GLOVE BOX MAY HAVE AN INTERNAL MALFUNCTION CAUSING LOSS OF FUEL PRESSURE,PUT A FUEL PRESSURE GAUGE ON IT AND CHECK PRESSURE,BE SURE TO RELEASE PRESSURE AS RECOMMENDED IN FACTORY SERVICE MANUAL.FIND A FUEL PUMP MODULE AT A JUNK YARD CHEAP & SWAP IT. GOOD LUCK! BSR 4 EVER!