coolioni Posted January 16, 2009 Report Share Posted January 16, 2009 Recently I have done the following to get my engine working right. New timing kit ( chains, sprokets, guides, tensioner , the whole thing) , new weber carb, new plugs, new wires, clutch master cylinder, new radiator, and new water pump. Even after warming the truck up, it tends to start getting real choppey(hesitating) when trying to accelerate. Sometimes I will take the truck out of gear and give it a few revs, and sometimes it goesw away, and sometimes it does not. I have brought it to my mechanic several times, and he cant seem to figure out what is causing this. Any ideas where I can tell him to look ? Thanks! Quote Link to comment
Mandingo Posted January 16, 2009 Report Share Posted January 16, 2009 did you check fuel pump, filter? Quote Link to comment
banzai510(hainz) Posted January 16, 2009 Report Share Posted January 16, 2009 (edited) Is it eleltrically timed? correctly. I assume the cam timming is OK since you installed the chain. as you say its OK then not OK. Make sure the distributor is locked down OK. Is this points or Electric Ignition? valve lash adjusted???? I dont think this is it. Is this a electric Choke? is the plate open when warmed up? I have seen if not adjusted correctly during the inbetween the cold(closed) and warm(open) there can be a stumble. If plate is fully open when warn and still does it then its the a NOT choke proplem. Edited January 16, 2009 by banzai510(hainz) Quote Link to comment
coolioni Posted January 16, 2009 Author Report Share Posted January 16, 2009 did you check fuel pump, filter? yes i just put a new filter. But I have not had the pump checked. Quote Link to comment
coolioni Posted January 16, 2009 Author Report Share Posted January 16, 2009 Is it eleltrically timed? correctly.I assume the cam timming is OK since you installed the chain. as you say its OK then not OK. Make sure the distributor is locked down OK. Is this points or Electric Ignition? valve lash adjusted???? I dont think this is it. Is this a electric Choke? is the plate open when warmed up? I have seen if not adjusted correctly during the inbetween the cold(closed) and warm(open) there can be a stumble. If plate is fully open when warn and still does it then its the a choke proplem. I am going to have my mechanic check all of this stuff and let you guys know. Thanks for the suggestions. Quote Link to comment
banzai510(hainz) Posted January 16, 2009 Report Share Posted January 16, 2009 this is stuff you can ck yourself and not cost you. Quote Link to comment
datzenmike Posted January 16, 2009 Report Share Posted January 16, 2009 Assume it's an '83 720. Weber carbs tend to like fuel pressure below 3 psi. The 720 electric fuel pump produces a pressure of 2.7-3.4psi. and can over power the Weber float and needle valve and cause it to flood. Not saying you should run out and get a fuel pressure regulator, but check into this. Quote Link to comment
Jason Posted January 16, 2009 Report Share Posted January 16, 2009 Another thing it could be is the ignition wires. I had a misfire and hesitation on acceleration and pulled my hair out until I took a multimeter to the ignition wires. Turned out that 2 and 4 had super high resistance compared to 1 and 3, 1 year old set of AC Delco wires too .... Quote Link to comment
coolioni Posted January 17, 2009 Author Report Share Posted January 17, 2009 i have wires that are about 4 months old on it. I bet they are fine. I have a funny feeling it may have something to do with the clutch. It is getting harder and harder to get it going into first gear without giving it alot of gas to keep it from stalling out. Something is definatly wrong, but my guy just cant figure it out. I am getting sick of fixing things and still having this hesitation problem. I thought it would go away when I redid the whole timing system, but it is still there. Now it is just nice and quiet and can easily do 85 on the highway. I have not pushed it faster, but there is definatly some pedal left to get it going faster. What is the normal top speed on this truck ???? Quote Link to comment
datzenmike Posted January 17, 2009 Report Share Posted January 17, 2009 New Weber carb? Like new out of the box. For what motor? Quote Link to comment
coolioni Posted January 17, 2009 Author Report Share Posted January 17, 2009 yes brand new weber out of the box. I have a 2.4 liter Z-24 engine. The truck is a king cab 4x4. Quote Link to comment
banzai510(hainz) Posted January 17, 2009 Report Share Posted January 17, 2009 Z24 that is a 8 plug head.????? I assume the wires are on there correct as there is a before and after firinging sincd it usinf 2 wires per cyl?? Im only guessing here on the if it does 85mph I think ithe motor would be OK. I cam only wish to drive my Datsun 521 85mph Quote Link to comment
a.d._510_n_ok Posted January 18, 2009 Report Share Posted January 18, 2009 Is this a electric Choke? is the plate open when warmed up? I have seen if not adjusted correctly during the inbetween the cold(closed) and warm(open) there can be a stumble. If plate is fully open when warn and still does it then its the a NOT choke proplem. hmmmmm, mine never stumbles when cold but will when warm........? Quote Link to comment
coolioni Posted January 18, 2009 Author Report Share Posted January 18, 2009 Z24 that is a 8 plug head.?????I assume the wires are on there correct as there is a before and after firinging sincd it usinf 2 wires per cyl?? Im only guessing here on the if it does 85mph I think ithe motor would be OK. I cam only wish to drive my Datsun 521 85mph How fast does a 521 go up to ? One of these days I will see how fast I can get mine going. I just want to make sure everything is running perfectly beforeI really push the engine. Yes there are 8 plugs on this engine. Kind of neat for a 4 cylinder engine. This herky jerky stumbling thing is driving me mad! I am getting sick of bringing it up to the shop. Just last week I was driving down the expresway and some road debrie from construction got into my engine. It put a hole in my new radiator and caused the water pump to break! There went another $460 ! It is a shame I love this truck, becuase lately I have been spending so much money restoring it, I could be driving a brand new truck. Probally for even less money. But this truck is one of the best looking trucks from back in the 80's along with the Landcruisers. But they are in a totally different class. One is a pickup and one is a SUV. Quote Link to comment
what Posted June 2, 2009 Report Share Posted June 2, 2009 wow man. hell of a thing. Quote Link to comment
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