Made a basic map with Uberdata .. 450ccs with a walbro pump. car cranks but no fuel in the cylinders.. we're baffled. pulled the fpr and fuel sprayed so there is fuel pressure. resistor pack is wired inline correctly. any thoughts?

Thanks!

 

Test that you are getting 12 volts to the injectors.

 

did you wire them up right?

check the burn too

 

remove the fuel rail with the injectors and crank the motor. check to see if ur get n spray

 

Any CELs?

 

We tried to check the power going to the resistor box, but didn't see much voltage there. Problem is we have a digital multimeter and it only gets voltage when you crank.. so it jumps all over the place. May be worth trying to pull the rail and injectors and see what is causing them not to spray, just hoping there was an easier way. we tried checking voltage on the injector clip when we cranked and saw nothing.

 

my friend had a similar problem and it turned out to be his clutch sensor. maybe check that? just a thought.

 

i had the same problum...come to find out the resistor box didnt have a good enough ground to the frame...my issue is now solved. good luck

 

Thanks for the advice. I will try troubleshooting again later today.

Does anyone know if I can check voltage powering the resistor pack when the key is only in the 'ON' position, or if I actually need to crank. What voltage should I see?

What kind of voltage should I see on the injector clip when cranking the engine? Spikes of 12V?

TIA!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by spike &raquo;</TD></TR><TR><TD CLASS="quote">Thanks for the advice. I will try troubleshooting again later today.

Does anyone know if I can check voltage powering the resistor pack when the key is only in the 'ON' position, or if I actually need to crank. What voltage should I see?

What kind of voltage should I see on the injector clip when cranking the engine? Spikes of 12V?

TIA!</TD></TR></TABLE>

when the key is ON position....you should see 12v...you shouldnt have to crank....i dont

 

awesome thanks. will check it out.

 

can I try running a wire from the battery to the red wire on the resistor pack? That way I can test if the problem lies before or after the resitor pack? Car should start if I do this.. correct?

Thanks again!

 

Injectors have 12v at all time, they use the ground to fire them. SO if your checking voltage between the wires in the injectors clips you will have to crank it to see volts. If you use a chassie ground on the volt meter you should see 12v on the positive. you may not see 12v if you hook the voltmeter up to both the wires in the clip as it only triggers the ground for a split second. you have to either use a analog multimeter or a knoid light.