Rb20det silver top idleing rough at cold and hard to start - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Empire087 · 08-15-2014, 07:55 PM

So ive been slowly getting my rb running a little better every day. So heres the breakdown:
Car will start, but it takes gas to get it to start when cold. It will turn over and turn over and try and start a few times. Battery is brand new 800cca.
-Car once started will run rough, and it may die. However if it idles for more than 10 seconds or so it will usually stay running.
-Car will make it all the way to warm and idle up.
-if i where to shut it off i may have to apply gas to start it again.
-for whatever reason my stock tach wont even work, and my aftermarket tach wont work. I even wired in a 10k resistor. Not sure why.

I replaced the coolant temp sensor made no difference, pretty sure i wired everything correctly. If anyone can give me a hand id greatly appreciate it!

Thanks,
Dakota

Sileighty_85 · 08-15-2014, 08:01 PM

Dirty/Bad MAFS, Boost or Vac leaks, Old/Bad spark plugs.

Empire087 · 08-16-2014, 06:21 PM

Quote:

Originally Posted by Sileighty_85

Dirty/Bad MAFS, Boost or Vac leaks, Old/Bad spark plugs.

Thanks so much on those!!!! replaced the spark plugs and cleaned the maf and it fired to life like right away, despite not having the maf hooked up lol. I was leaning towards spark plugs before but you confirmed it for me.

Again thanks a ton!

Sileighty_85 · 08-16-2014, 07:19 PM

Quote:

Originally Posted by Empire087

Thanks so much on those!!!! replaced the spark plugs and cleaned the maf and it fired to life like right away, despite not having the maf hooked up lol. I was leaning towards spark plugs before but you confirmed it for me.

Again thanks a ton!

Nice, No prob.

just make sure you gap the plugs properly, (they are not pre gaped)

Cant remember for RB20, so search around and see what ppl gap theirs to.

Empire087 · 08-16-2014, 08:50 PM

Im running a bkr7e, which im pretty sure came pre gapped at .032. I double checked all of them and made sure they where the same. I figure so long as it doesnt blow out under boost ill call it good. If not ill just re gap them to what everyone runs those plugs at .028.

08-15-2014, 07:55 PM	#1
Empire087 Leaky Injector Join Date: Jun 2014 Location: Marinette/Menominee Age: 27 Posts: 54 Trader Rating: (0) Feedback Score: 0 reviews	Rb20det silver top idleing rough at cold and hard to start So ive been slowly getting my rb running a little better every day. So heres the breakdown: Car will start, but it takes gas to get it to start when cold. It will turn over and turn over and try and start a few times. Battery is brand new 800cca. -Car once started will run rough, and it may die. However if it idles for more than 10 seconds or so it will usually stay running. -Car will make it all the way to warm and idle up. -if i where to shut it off i may have to apply gas to start it again. -for whatever reason my stock tach wont even work, and my aftermarket tach wont work. I even wired in a 10k resistor. Not sure why. I replaced the coolant temp sensor made no difference, pretty sure i wired everything correctly. If anyone can give me a hand id greatly appreciate it! Thanks, Dakota

08-15-2014, 08:01 PM	#2
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	Dirty/Bad MAFS, Boost or Vac leaks, Old/Bad spark plugs. __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

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08-16-2014, 08:50 PM	#5
Empire087 Leaky Injector Join Date: Jun 2014 Location: Marinette/Menominee Age: 27 Posts: 54 Trader Rating: (0) Feedback Score: 0 reviews	Im running a bkr7e, which im pretty sure came pre gapped at .032. I double checked all of them and made sure they where the same. I figure so long as it doesnt blow out under boost ill call it good. If not ill just re gap them to what everyone runs those plugs at .028.