Richard 91 Posted March 16, 2020 Posted March 16, 2020 Must pump gas 6 or 8 times while cranking before starting. If you pump gas before cranking, rpm is high and will not come down.
jdog Posted March 16, 2020 Posted March 16, 2020 Shouldn't have to pump the gas, I'd look at ics sticking, could also be a going bad fuel pump. Have you done cruisers tips?
jeremyc50 Posted March 16, 2020 Posted March 16, 2020 Same goes for me. Where are the tips?Sent from my iPhone using Tapatalk
Eagle Posted March 16, 2020 Posted March 16, 2020 Pumping the gas peddle does NOTHING with fuel injection. That was something we did back in the days of carburetors -- pumping the skinny peddle activated a thingie inside the carb called the accelerator pump, which shot a heavy squirt of gas into the venturi.
Warren Mohler Posted March 16, 2020 Posted March 16, 2020 The only thing the gas pedal will do for you is if you go WOT cranking, then you are in "clear flood mode" ECU shuts down fuel to clear excess fuel. Question, is your hard start condition cold-hot or all the time? Keep in mind all Renix 4.0L are slow to start compared to newer model EFI automobiles
Richard 91 Posted March 17, 2020 Author Posted March 17, 2020 Hot or cold does the same thing, looking back on the the maintenance records I was given the fuel pump has never been changed.
Eagle Posted March 17, 2020 Posted March 17, 2020 Could you clarify what you mean by "hard starting"? According to your signature, you have an '88. Are you aware that ALL the Renix vehicles require a comparatively long crank time while the ECU figures out where everything is? According to my fuzzy way of understanding it, the Renix ECU has no memory. Unlike later years, the Renix ECU doesn't "learn" anything and then store it so it can be ready to rock-n-roll at the next start. It has to begin from scratch, each and every time you start the engine. That requires several full revolutions and a few seconds to happen.
Richard 91 Posted March 17, 2020 Author Posted March 17, 2020 I understand that that just hitting the starter for a few seconds will start the engine, but I should not have to turn it over for 30 seconds while pumping gas paddle before its starts is not the norm. after it cranks it runs smooth, just fell something is not right.
Warren Mohler Posted March 17, 2020 Posted March 17, 2020 1 hour ago, Richard 91 said: Hot or cold does the same thing, looking back on the the maintenance records I was given the fuel pump has never been changed. Don't go throwing parts at it, if it runs ok after it starts doubt that is the problem. Try cranking like one revolution then go WOT while still in crank and see what happens DON'T PUMP
cruiser54 Posted March 17, 2020 Posted March 17, 2020 Your CPS could be weak, or it's signal is meeting resistance in the c101....
Eagle Posted March 17, 2020 Posted March 17, 2020 1 hour ago, Richard 91 said: I understand that that just hitting the starter for a few seconds will start the engine, but I should not have to turn it over for 30 seconds while pumping gas paddle before its starts is not the norm. after it cranks it runs smooth, just fell something is not right. Is it really 30 seconds? Have you timed it? We're trying to help you diagnose by remote control here. If we're going to help, we need accurate information, not hyperbole. Is it really 30 seconds, or does it just feel like 30 seconds?
omega_rugal Posted March 17, 2020 Posted March 17, 2020 30 secs? your started must be fried by now 2 hours ago, Eagle said: ALL the Renix vehicles require a comparatively long crank time while the ECU figures out where everything is? define long. with a hot engine and thus a properly primed LPG, my truck starts in less than 2 secs, i release the key as soon as the engine begins to turn and most of the times it starts. of course the camshaft sensor is disconnected so the ECU ignores it right away and goes to batch mode inyection even if i have no inyectors to fire, that must save cranking time
omega_rugal Posted March 17, 2020 Posted March 17, 2020 10 hours ago, Eagle said: Pumping the gas peddle does NOTHING with fuel injection. i don't know about the renix but AFAIK older inyection systems did add some extra fuel if the driver pressed the gas pedal while cranking, back when carbs and FI coexisted
Richard 91 Posted March 18, 2020 Author Posted March 18, 2020 Cleaned the ground point on the engine today, tried starting without pumping the gas and it started fine didn't even stumble. I plan on going through the other tips as well. Would not have guessed a ground would be the problem.
omega_rugal Posted March 18, 2020 Posted March 18, 2020 1 hour ago, Richard 91 said: Would not have guessed a ground would be the problem. grounds are the otehr half of any electric circuit.
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