SR20DET won't rev past 1500 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

gripandslide · 03-18-2014, 01:04 PM

Dropped a wrench on the battery for a quick second and now the car wont rev past 1500. I've read that if you bridge a battery while the car is off all you do is kill the battery.
I have:
z32 maf
550cc injectors
rs enthalpy rom tune

I opened up the ecu and made sure nothing fried in there. Also redid the grounds and tested them, they came out all good. Tried unplugging the maf and running it, same issue.
Thanks in advanced

smokescreen240 · 03-18-2014, 01:47 PM

sounds like the MAF or MAF wires could be bad. Not sure, but when i couldn't get above 2k rpm, i unplugged my maf, cleaned it, and replugged it. worked fine.

gripandslide · 03-18-2014, 01:52 PM

I also read that as well, so i cleaned it with contact cleaner, still same issue. Im waiting on a buddy to bring a spare z32 maf so i could try it out.

adams 02rs · 03-18-2014, 02:07 PM

Just a tip, Not too sure but it could be in limp mode. Try resetting the ecu.

If not its def. the maf ,Had a similar issue with a maf and wouldn't rev past 2500 and sounded like absolute shit

pacotaco345 · 03-18-2014, 02:39 PM

This sounds really simple but, have you checked the fuses in the engine bay? I know when I grounded something out I popped the main 75A fuseable link thats in there...

gripandslide · 03-18-2014, 02:43 PM

Fuses were the first thought in mind. Checked the fuses and relays in the engine bay, and then check all the fuses in the kick panel.

gripandslide · 03-18-2014, 02:45 PM

Quote:

Originally Posted by pacotaco345

This sounds really simple but, have you checked the fuses in the engine bay? I know when I grounded something out I popped the main 75A fuseable link thats in there...

But it doesnt help to double check. Ill look over everything and report back

gripandslide · 03-18-2014, 03:07 PM

UPDDATE:
So i just read the ecu's codes. Came up as 55 which means no codes if im correct. Now im going to clear the ecu anyways and see what happens while i wait for my buddy to bring the other z32 maf. Any other suggestions?

gripandslide · 03-18-2014, 03:12 PM

I forgot to mention i swapped ignitor chips with my roomates, same issue

adams 02rs · 03-18-2014, 04:25 PM

(55)=all clear. You are correct. Hows your engine harness? The reason I ask is because a really messed up harness can give you all sorts of issues, and the ignitor is not the issue.

gripandslide · 03-18-2014, 07:22 PM

Quote:

Originally Posted by adams 02rs

(55)=all clear. You are correct. Hows your engine harness? The reason I ask is because a really messed up harness can give you all sorts of issues, and the ignitor is not the issue.

I havent really checked the harness yet, but ill do that right now. Im hoping its just a fried z32 maf

gripandslide · 03-18-2014, 09:46 PM

Tried my buddys z32 maf, same thing.

eek · 03-18-2014, 11:02 PM

So not sure if your ROM tune is setup for Z32 maf or not, but if it is not you need a SAFC or something to read that z32 maf.

***dorkidori_s13*** · 03-18-2014, 11:50 PM

spend the money and invest in a datalink cable! download ECUTalk or find someone with NISTUNE. both of which will give you a read out of every functional sensor on your car! it majorly helps with tracking down bugs likes youre having!

gripandslide · 03-20-2014, 10:09 PM

UPDATE:
Figured out the problem. One of the splicing on the maf wire (not ground) had come undone. And dropping the wrench on the battery had nothing to do with the issue, it was just a huge coincidence haha. Thanks for all the help guys! Oh btw, after redoing the grounds and sanding the contact points, the car runs so much better and doesn't die out any more.

03-18-2014, 01:04 PM	#1
gripandslide Join Date: Jun 2013 Location: Bay area Age: 28 Posts: 20 Trader Rating: (0) Feedback Score: 0 reviews	SR20DET won't rev past 1500 Dropped a wrench on the battery for a quick second and now the car wont rev past 1500. I've read that if you bridge a battery while the car is off all you do is kill the battery. I have: z32 maf 550cc injectors rs enthalpy rom tune I opened up the ecu and made sure nothing fried in there. Also redid the grounds and tested them, they came out all good. Tried unplugging the maf and running it, same issue. Thanks in advanced

03-18-2014, 01:47 PM	#2
smokescreen240 Zilvia Junkie Join Date: Dec 2011 Location: Hampton VA Age: 30 Posts: 417 Trader Rating: (1) Feedback Score: 1 reviews	sounds like the MAF or MAF wires could be bad. Not sure, but when i couldn't get above 2k rpm, i unplugged my maf, cleaned it, and replugged it. worked fine. __________________ (*≧▽≦)

03-18-2014, 02:39 PM	#5
pacotaco345 Zilvia FREAK! Join Date: Jan 2010 Location: SoCal/Ft Worth TX Age: 27 Posts: 1,549 Trader Rating: (5) Feedback Score: 5 reviews	This sounds really simple but, have you checked the fuses in the engine bay? I know when I grounded something out I popped the main 75A fuseable link thats in there... __________________

03-18-2014, 11:50 PM	#14
*dorkidori_s13* ITS LISA'S FAULT!!! Join Date: Jun 2003 Location: Las Vegas Age: 39 Posts: 7,331 Trader Rating: (41) Feedback Score: 41 reviews	spend the money and invest in a datalink cable! download ECUTalk or find someone with NISTUNE. both of which will give you a read out of every functional sensor on your car! it majorly helps with tracking down bugs likes youre having! __________________ Bought something from me??? POST A REVIEW HERE!!!

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03-18-2014, 01:52 PM	#3
gripandslide Join Date: Jun 2013 Location: Bay area Age: 28 Posts: 20 Trader Rating: (0) Feedback Score: 0 reviews	I also read that as well, so i cleaned it with contact cleaner, still same issue. Im waiting on a buddy to bring a spare z32 maf so i could try it out.

03-18-2014, 02:07 PM	#4
adams 02rs Zilvia Addict Join Date: Jun 2013 Location: just ask. 92549 socal. Posts: 673 Trader Rating: (25) Feedback Score: 25 reviews	Just a tip, Not too sure but it could be in limp mode. Try resetting the ecu. If not its def. the maf ,Had a similar issue with a maf and wouldn't rev past 2500 and sounded like absolute shit

03-18-2014, 02:43 PM	#6
gripandslide Join Date: Jun 2013 Location: Bay area Age: 28 Posts: 20 Trader Rating: (0) Feedback Score: 0 reviews	Fuses were the first thought in mind. Checked the fuses and relays in the engine bay, and then check all the fuses in the kick panel.

03-18-2014, 03:07 PM	#8
gripandslide Join Date: Jun 2013 Location: Bay area Age: 28 Posts: 20 Trader Rating: (0) Feedback Score: 0 reviews	UPDDATE: So i just read the ecu's codes. Came up as 55 which means no codes if im correct. Now im going to clear the ecu anyways and see what happens while i wait for my buddy to bring the other z32 maf. Any other suggestions?

03-18-2014, 03:12 PM	#9
gripandslide Join Date: Jun 2013 Location: Bay area Age: 28 Posts: 20 Trader Rating: (0) Feedback Score: 0 reviews	I forgot to mention i swapped ignitor chips with my roomates, same issue

03-18-2014, 04:25 PM	#10
adams 02rs Zilvia Addict Join Date: Jun 2013 Location: just ask. 92549 socal. Posts: 673 Trader Rating: (25) Feedback Score: 25 reviews	(55)=all clear. You are correct. Hows your engine harness? The reason I ask is because a really messed up harness can give you all sorts of issues, and the ignitor is not the issue.

03-18-2014, 09:46 PM	#12
gripandslide Join Date: Jun 2013 Location: Bay area Age: 28 Posts: 20 Trader Rating: (0) Feedback Score: 0 reviews	Tried my buddys z32 maf, same thing.

03-18-2014, 11:02 PM	#13
eek Zilvia FREAK! Join Date: Feb 2004 Location: California Age: 40 Posts: 1,025 Trader Rating: (29) Feedback Score: 29 reviews	So not sure if your ROM tune is setup for Z32 maf or not, but if it is not you need a SAFC or something to read that z32 maf.

03-20-2014, 10:09 PM	#15
gripandslide Join Date: Jun 2013 Location: Bay area Age: 28 Posts: 20 Trader Rating: (0) Feedback Score: 0 reviews	UPDATE: Figured out the problem. One of the splicing on the maf wire (not ground) had come undone. And dropping the wrench on the battery had nothing to do with the issue, it was just a huge coincidence haha. Thanks for all the help guys! Oh btw, after redoing the grounds and sanding the contact points, the car runs so much better and doesn't die out any more.