SR20det start up problems HELP!!!! PLZZZ - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

driftcrazy · 06-13-2005, 01:40 AM

ok so we jus got done doing a s13 SR swap ina 89 240sx. everything is connected and wiring is complete. but when we went 2 start it, it would not start. there is spark, and fuel but there seems 2 be a problem with lack of vacume 2 operate the pressure regulator. so fuel is not being dipursed in the combustion. we took offf the regulator and pluged the fuel line derectly 2 the rail and started it and it start up for a bit when we would fluctuate the vacume by blocking it off. there is really low vacume form the manifold.

anybody got any clue 2 whas going on!!! cuz we don konw. all we know its a vacume issue. PLZ help we have been on this matter 4 2days now. thank you

g2ic02 · 06-14-2005, 05:27 PM

are you sure it isn't something dumb like the ground at the back of the valve cover.........i don't know how much vacuum you would build if your motor is just cranking over. Have you tried replacing the fpr???

ultraDorksGarage · 06-14-2005, 05:35 PM

try this...

crank over motor, when it doesnt start...

pull out a couple injector harnesses and try cranking it over, if it stumbles to life, then ur prolly got bad wirirng, causing ecu to dump fuel.

honest, try it

driftcrazy · 06-15-2005, 02:23 AM

thanks guys for all the ideads, but i fiugred it out, it did end up being somthing stupid tho. lol. what ended up happening was that i reversed the fuel line . so fuesl was going the way it should have came out. DHA! stupid huh. lol

but thanks yall. but do u guys know how 2 wire up a KA MAF 2 the sr harness?? is it just color matching?? or is there a certain way??

420sx · 06-15-2005, 08:14 AM

polarity/color matchin on sohc maf

skiboard06 · 06-15-2005, 08:54 PM

where is the ground on the sr on the back of the valve cover what does it look like/ is it near the head or the low part of the block where does it ground too etc thanks for ur help

speeddreamz · 06-15-2005, 10:09 PM

its around where the spark plug cover is, it usually connects to a spade connector where the hardline for the brake booster is.

TO the original poster, fuel pressure regulator on the return line, fuel filter on the inline.

06-13-2005, 01:40 AM	#1
driftcrazy Zilvia Member Join Date: Sep 2003 Location: concord, CA Age: 37 Posts: 148 Trader Rating: (0) Feedback Score: 0 reviews	SR20det start up problems HELP!!!! PLZZZ ok so we jus got done doing a s13 SR swap ina 89 240sx. everything is connected and wiring is complete. but when we went 2 start it, it would not start. there is spark, and fuel but there seems 2 be a problem with lack of vacume 2 operate the pressure regulator. so fuel is not being dipursed in the combustion. we took offf the regulator and pluged the fuel line derectly 2 the rail and started it and it start up for a bit when we would fluctuate the vacume by blocking it off. there is really low vacume form the manifold. anybody got any clue 2 whas going on!!! cuz we don konw. all we know its a vacume issue. PLZ help we have been on this matter 4 2days now. thank you

06-15-2005, 08:14 AM	#5
420sx Post Whore! Join Date: Jun 2004 Location: Texas Age: 38 Posts: 3,960 Trader Rating: (0) Rides Gallery: 420sx Feedback Score: 0 reviews	polarity/color matchin on sohc maf __________________ hydropgrahics! ls1......

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06-14-2005, 05:27 PM	#2
g2ic02 Zilvia Junkie Join Date: Jul 2003 Location: minnesota Posts: 480 Trader Rating: (3) Feedback Score: 3 reviews	are you sure it isn't something dumb like the ground at the back of the valve cover.........i don't know how much vacuum you would build if your motor is just cranking over. Have you tried replacing the fpr???

06-14-2005, 05:35 PM	#3
ultraDorksGarage Zilvia Member Join Date: Mar 2005 Location: Hawaii Posts: 204 Trader Rating: (0) Feedback Score: 0 reviews	try this... crank over motor, when it doesnt start... pull out a couple injector harnesses and try cranking it over, if it stumbles to life, then ur prolly got bad wirirng, causing ecu to dump fuel. honest, try it

06-15-2005, 02:23 AM	#4
driftcrazy Zilvia Member Join Date: Sep 2003 Location: concord, CA Age: 37 Posts: 148 Trader Rating: (0) Feedback Score: 0 reviews	thanks guys for all the ideads, but i fiugred it out, it did end up being somthing stupid tho. lol. what ended up happening was that i reversed the fuel line . so fuesl was going the way it should have came out. DHA! stupid huh. lol but thanks yall. but do u guys know how 2 wire up a KA MAF 2 the sr harness?? is it just color matching?? or is there a certain way??

06-15-2005, 08:54 PM	#6
skiboard06 Leaky Injector Join Date: Mar 2005 Location: Cincinnati Posts: 115 Trader Rating: (0) Feedback Score: 0 reviews	where is the ground on the sr on the back of the valve cover what does it look like/ is it near the head or the low part of the block where does it ground too etc thanks for ur help

06-15-2005, 10:09 PM	#7
speeddreamz Zilvia FREAK! Join Date: Jan 2003 Location: San Francisco, California Age: 36 Posts: 1,015 Trader Rating: (0) Feedback Score: 0 reviews	its around where the spark plug cover is, it usually connects to a spade connector where the hardline for the brake booster is. TO the original poster, fuel pressure regulator on the return line, fuel filter on the inline.