Engine wants to die when braking - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Tubed4evr · 08-18-2003, 10:48 AM

When coming off load and braking the engine seems like it wants to die. The rpms will fall below idle speed to about 450-500 RPM and hover there for a minute and then slowly come back up to the normal 750 RPM. It only happens when decelerating ( I tried hitting the brakes from a stand still and it had no effect) The car runs strong otherwise. I have cleaned the battery terminals for good measure and the plugs and wires are only 4 months old. Any ideas?

Thanks

Ryan

DamnedButDetermined · 08-18-2003, 04:16 PM

I had a similar problem when my brake booster broke. Check and see if you have a leak in you brake booster vacuum line. Also check to see if you have any other vacuum leaks.

sorry couldn't be more help, but good luck.

DbD

Thurazor · 08-18-2003, 10:23 PM

Is this when you're decelerating only? Or only with the clutch down?

Tubed4evr · 08-19-2003, 04:47 PM

When decelerating with clutch in.

TonyC · 08-19-2003, 07:40 PM

I have the same problem. Sometimes it stalls when I'm braking.

Thurazor · 08-19-2003, 08:14 PM

Put the car in neutral and rev it up and see if it does the same thing. If it doesn't, then it seems like it would be a vacuum problem.

Tubed4evr · 08-19-2003, 09:08 PM

Yea I'll have to check out the vacuum thing becuase it only happens when decelerating. I cannot produce the problem from a stand still. Thanks all.

Ryan

twitchy · 08-19-2003, 11:30 PM

same thing happened to me last month, exactly the same thing.

CHANGE YOUR FUEL FILTER

I did that and the problem was gone the next time I drove

Yoshi · 08-20-2003, 10:59 AM

hmm.. .I had the same thing too, it was cuz my timing was way off.

*sykikchimp* · 08-20-2003, 11:36 AM

there are about a billion different possibilities, and this is a very common problem.

There is some stuff in the FAQ about it. And lots in the search.

some causes:
bad grounding
Dirty IACV
Dirty EGR
Dirty AIV
MAF's going bad
leaking injectors, or bad o-rings
Dirty Fuel Filter
Old Ignition system componants
Bad o2 sensor.

Many of these will come with other symptoms, but most the time I see this happening b/c the AIV or IACV are old and crusty, and the little seals are getting old.

all stock · 03-16-2007, 08:49 PM

mine is doing the same thing. except it also stumbles when i blip in neutral only to around 2000. cleaned iacv, replaced ALL vacuum lines (removed mani), removed egr, regrounded maf, replaced filters...

i'm going to be replacing the brake booster soon too..if that doesn't do it, i odn't know what will.

GSXRJJordan · 03-16-2007, 08:56 PM

yup, see this all the time on SRs - most of the time, the people have their BOV's venting to atmosphere, and think that's the cause - it's usually not!

All the things chimp listed above are great things to check, as are the FAQs and any search topics you can find. My S13 does it too, but I know it's a vacuum problem (brake booster line is cracking), and it doesn't actually stall the car, so I'm alright with it for now. Check the search topics for additional symptoms for each part and narrow it down.

Also, it helps a ton if you list the engine and any mods when you post a problem like this... just an FYI.

all stock · 03-17-2007, 08:58 AM

heh, BONE STOCK ka24de. it's being prepped for SCCA ITS class. but will be going thru NASA TTF AND PTE along the way. oh, emissions were removed. haha.

08-18-2003, 10:48 AM	#1
Tubed4evr Zilvia Member Join Date: Aug 2002 Location: Virginia Tech / Chesapeake, VA Posts: 223 Trader Rating: (0) Feedback Score: 0 reviews	Engine wants to die when braking When coming off load and braking the engine seems like it wants to die. The rpms will fall below idle speed to about 450-500 RPM and hover there for a minute and then slowly come back up to the normal 750 RPM. It only happens when decelerating ( I tried hitting the brakes from a stand still and it had no effect) The car runs strong otherwise. I have cleaned the battery terminals for good measure and the plugs and wires are only 4 months old. Any ideas? Thanks Ryan

08-18-2003, 10:23 PM	#3
Thurazor Zilvia Member Join Date: Nov 2001 Location: Rockland, ME Age: 42 Posts: 181 Trader Rating: (0) Feedback Score: 0 reviews	Is this when you're decelerating only? Or only with the clutch down? __________________ - Jared Edwards 3S Hybrid [img]too.big.jpg[/img] "Mandies, sandies, peppermint candies, we do it right and we drink a lot of antifreeze." - Group X

08-19-2003, 08:14 PM	#6
Thurazor Zilvia Member Join Date: Nov 2001 Location: Rockland, ME Age: 42 Posts: 181 Trader Rating: (0) Feedback Score: 0 reviews	Put the car in neutral and rev it up and see if it does the same thing. If it doesn't, then it seems like it would be a vacuum problem. __________________ - Jared Edwards 3S Hybrid [img]too.big.jpg[/img] "Mandies, sandies, peppermint candies, we do it right and we drink a lot of antifreeze." - Group X

08-19-2003, 11:30 PM	#8
twitchy Zilvia FREAK! Join Date: Apr 2003 Location: Ontario Posts: 1,579 Trader Rating: (0) Feedback Score: 0 reviews	same thing happened to me last month, exactly the same thing. CHANGE YOUR FUEL FILTER I did that and the problem was gone the next time I drove __________________ Who the hell needs a sig anyhow

08-20-2003, 10:59 AM	#9
Yoshi Post Whore! Join Date: Jul 2001 Location: Washington Age: 48 Posts: 3,003 Trader Rating: (1) Rides Gallery: Yoshi Feedback Score: 1 reviews	hmm.. .I had the same thing too, it was cuz my timing was way off. __________________ www.360realms.com/S13-S15

08-18-2003, 04:16 PM	#2
DamnedButDetermined Zilvia Addict Join Date: Oct 2002 Location: Jax, Fl Age: 43 Posts: 637 Trader Rating: (1) Feedback Score: 1 reviews	I had a similar problem when my brake booster broke. Check and see if you have a leak in you brake booster vacuum line. Also check to see if you have any other vacuum leaks. sorry couldn't be more help, but good luck. DbD

08-19-2003, 04:47 PM	#4
Tubed4evr Zilvia Member Join Date: Aug 2002 Location: Virginia Tech / Chesapeake, VA Posts: 223 Trader Rating: (0) Feedback Score: 0 reviews	When decelerating with clutch in.

08-19-2003, 07:40 PM	#5
TonyC Leaky Injector Join Date: Mar 2003 Location: Fresno, CA Posts: 70 Trader Rating: (0) Feedback Score: 0 reviews	I have the same problem. Sometimes it stalls when I'm braking.

08-19-2003, 09:08 PM	#7
Tubed4evr Zilvia Member Join Date: Aug 2002 Location: Virginia Tech / Chesapeake, VA Posts: 223 Trader Rating: (0) Feedback Score: 0 reviews	Yea I'll have to check out the vacuum thing becuase it only happens when decelerating. I cannot produce the problem from a stand still. Thanks all. Ryan

08-20-2003, 11:36 AM	#10
sykikchimp WOW addicted Join Date: Dec 2001 Location: the moon Age: 44 Posts: 6,525 Trader Rating: (0) Feedback Score: 0 reviews	there are about a billion different possibilities, and this is a very common problem. There is some stuff in the FAQ about it. And lots in the search. some causes: bad grounding Dirty IACV Dirty EGR Dirty AIV MAF's going bad leaking injectors, or bad o-rings Dirty Fuel Filter Old Ignition system componants Bad o2 sensor. Many of these will come with other symptoms, but most the time I see this happening b/c the AIV or IACV are old and crusty, and the little seals are getting old. __________________

03-16-2007, 08:49 PM	#11
all stock Zilvia Junkie Join Date: Oct 2003 Location: Irvine Posts: 312 Trader Rating: (0) Feedback Score: 0 reviews	mine is doing the same thing. except it also stumbles when i blip in neutral only to around 2000. cleaned iacv, replaced ALL vacuum lines (removed mani), removed egr, regrounded maf, replaced filters... i'm going to be replacing the brake booster soon too..if that doesn't do it, i odn't know what will.

03-16-2007, 08:56 PM	#12
GSXRJJordan Post Whore! Join Date: May 2006 Location: San Diego, CA Posts: 9,135 Trader Rating: (19) Rides Gallery: GSXRJJordan Feedback Score: 19 reviews	yup, see this all the time on SRs - most of the time, the people have their BOV's venting to atmosphere, and think that's the cause - it's usually not! All the things chimp listed above are great things to check, as are the FAQs and any search topics you can find. My S13 does it too, but I know it's a vacuum problem (brake booster line is cracking), and it doesn't actually stall the car, so I'm alright with it for now. Check the search topics for additional symptoms for each part and narrow it down. Also, it helps a ton if you list the engine and any mods when you post a problem like this... just an FYI. __________________ Jordan Innovations has a new web site! www.JordanInnovations.com -- All your favorite FD Pro Drifters love it, trust me -- www.JordanInnovations.com

03-17-2007, 08:58 AM	#13
all stock Zilvia Junkie Join Date: Oct 2003 Location: Irvine Posts: 312 Trader Rating: (0) Feedback Score: 0 reviews	heh, BONE STOCK ka24de. it's being prepped for SCCA ITS class. but will be going thru NASA TTF AND PTE along the way. oh, emissions were removed. haha.

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