JIM73240Z Posted March 24, 2008 Share Posted March 24, 2008 Here is a short vid of my car trying to run. short story is the car sat for 6 years. I now want to start driving it again but i can not get it to run longer than 20 sec. I replaced the gas tank, flexable fuel lines, blew out hard lines with 135 psi, fuel filters, pump, injectors, new oil, filter, plugs, wires, cap, rotor, thermostat, water temp sensor. The afm works. All of the electrical connections look solid. i am out of ideas. I went through the FI Bible. No luck. i have been at this for a few months now and have searched quite a bit sor ideas. anything that you can come up with i would greatly appreciate it. In the video, the car does respond to throttle inputs, but dies on its own. Yes, there is an exhaust leak. I have replaced the gasket numerous times when i did drive it. And yes it needs a bath but i doubt that dirt is making it run like crap TIA jimbo Quote Link to comment Share on other sites More sharing options...
sweetleaf Posted March 24, 2008 Share Posted March 24, 2008 What is the FP at now? 135 is WAY too hight, sounds like your return line is clogged. Quote Link to comment Share on other sites More sharing options...
MJLamberson Posted March 24, 2008 Share Posted March 24, 2008 when my car hasnt run for a while it needs to warm up real good for a while before I touch the throttle.. have you tried starting it and letting it idle without giving it gas? how long does it last... hows your timing? Quote Link to comment Share on other sites More sharing options...
JIM73240Z Posted March 24, 2008 Author Share Posted March 24, 2008 The FP is at 20 psi I think the last time I checked it. I blew out the lines with 135psi of air out of my compressor. The timing has not changed and the car will not stay on long enough to warm up. Only 20-30 sec at a time. Jimbo Quote Link to comment Share on other sites More sharing options...
JSM Posted March 24, 2008 Share Posted March 24, 2008 Are you sure the FP is staying at 20 PSI? Is there the posibility that there isn't enough presure, thus dying out? How do your plugs look? Once it dies will it start back up right away? How long does it take to repeat the scenario? If not do you still have spark? Quote Link to comment Share on other sites More sharing options...
JIM73240Z Posted March 24, 2008 Author Share Posted March 24, 2008 it will do that all day long and the plugs look ok. mabey the fp is too low, i have no idea anymore. jimbo Quote Link to comment Share on other sites More sharing options...
MJLamberson Posted March 24, 2008 Share Posted March 24, 2008 20psi is low Quote Link to comment Share on other sites More sharing options...
JSM Posted March 24, 2008 Share Posted March 24, 2008 My thinking is before you start the car the system primes enough to get pressure to the injectors. Once running the demand is to high to keep running and starves for fuel. You checked all your AFM boots for vacuum leaks and cracks? What about other vacuum leaks? Quote Link to comment Share on other sites More sharing options...
JIM73240Z Posted March 24, 2008 Author Share Posted March 24, 2008 vacume lines look good. afm boots are good. its posible that the fp is low. i will get the gauge on it again to make sure. what is is supposed to be at? jimbo Quote Link to comment Share on other sites More sharing options...
MJLamberson Posted March 24, 2008 Share Posted March 24, 2008 30-45 iirc... and I have an extra fuel pressure regulator I will give you if you need it, let me know Quote Link to comment Share on other sites More sharing options...
datsun40146 Posted March 24, 2008 Share Posted March 24, 2008 My bet, is that it's the afm. This is just a guess but I had a very similar problem. There is a strip of metal that when contact is made or broken I can't remeber which, that fuel is cut. Its called the "angel" switch, its there so that in the case of an accident the fuel pump will shut off and not flood the crash site with gas. Here is what I think you should try. 1st. Check and double check your AFM connections for frayed wires or shorts. 2nd. If that checks out, then run a hot wire from your fuel pump to your battery so it cannot shut off. This IS NOT SAFE! I only want you to do this to see if it is a fuel pump power related problem. 3rd. If 2nd is ture that pop off your afm cover and bend back the tab of metal just a bit, so that it breaks contact as soon as the afm flap is moved. Give those a shot and get back to me. Quote Link to comment Share on other sites More sharing options...
280Zone Posted March 25, 2008 Share Posted March 25, 2008 I'd get the FP up first, and verify flow rate. I have extra AFM's, ECU's etc and an ECCS analyzer if it comes to that. Quote Link to comment Share on other sites More sharing options...
1rad280 Posted March 26, 2008 Share Posted March 26, 2008 It sound just like mine did befor it went to hell. Quote Link to comment Share on other sites More sharing options...
JIM73240Z Posted May 1, 2008 Author Share Posted May 1, 2008 finally. IT RUNS. tried afm. mine im sure wrked untill i tried to take the cover off. opps. new afm. put fp gauge on there again. hits 40 psi and then drains to 10 in about 20 sec. of bad fuel pump? teid another. nope. ok. throw some tools around the garage:evil:. i took jumper cables from my truck and hooked it up to the pump. it works. turned on the car, 35-40 psi solid. so after consulting with clifton, i run new wires to the fuel pump as the hot wire was not hot. tonight i drove the car around the block several times. brakes need work. the car bucks around a little bit when barely on the gas. need to figure that out. in a day or two i will drive it over to coyote garys place for him to look at and get the ac charged up and anything else that i missed. things are looking up finally. any ideas on the bucking? jimbo Quote Link to comment Share on other sites More sharing options...
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