2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

RX7 turns over, then dies out.

Thread Tools
 
Search this Thread
 
Old Sep 26, 2015 | 03:37 PM
  #1  
Prediict's Avatar
Thread Starter
Junior Member
 
Joined: Jun 2012
Posts: 14
Likes: 0
From: compton
RX7 turns over, then dies out.

http://s1383.photobucket.com/user/ca...=recent&page=1

Hello,

I have a 1986 NA rx7 and im having a problem starting the car. The car turns over and at soon it does it revs to aound 3000 rpm, then dies out. I replaced the fuel pump(and strainer), the fuel filter, the injectors, and spark plugs.

The previous owner deleted the egr and has block off plates, if that matters.

Edit 1: added a link to a video of me starting the car.

Last edited by Prediict; Sep 26, 2015 at 04:11 PM.
Reply
Old Sep 26, 2015 | 03:40 PM
  #2  
DC5Daniel's Avatar
Rotary Freak
Tenured Member 10 Years
iTrader: (10)
 
Joined: Jul 2012
Posts: 1,631
Likes: 89
From: Peachtree City, GA
Yes, it does matter. Symptom is of a large vacuum leak. Those block off plates, especially the EGR in particular, are prone to leaking.
Reply
Old Sep 26, 2015 | 03:59 PM
  #3  
Prediict's Avatar
Thread Starter
Junior Member
 
Joined: Jun 2012
Posts: 14
Likes: 0
From: compton
Originally Posted by DC5Daniel
Yes, it does matter. Symptom is of a large vacuum leak. Those block off plates, especially the EGR in particular, are prone to leaking.
So it could be a vacuum leak? Im thunking of going to a junk yard and looking for those parts.
Reply
Old Sep 26, 2015 | 04:20 PM
  #4  
satch's Avatar
Moderator
Tenured Member: 20 Years
iTrader: (1)
 
Joined: Jun 2005
Posts: 11,738
Likes: 16
From: tulsa,ok.
There is a fuel switch inside the AFM which could be problematic. Jumpering the fuel check connector bypasses the switch. If the problem exists then the fuel switch is not the likely culprit.
Reply
Old Sep 26, 2015 | 04:47 PM
  #5  
DC5Daniel's Avatar
Rotary Freak
Tenured Member 10 Years
iTrader: (10)
 
Joined: Jul 2012
Posts: 1,631
Likes: 89
From: Peachtree City, GA
Originally Posted by Prediict
So it could be a vacuum leak? Im thunking of going to a junk yard and looking for those parts.
There's no reason to go add them back on, unless you want to. Performing a vacuum leak/smoke test may reveal the culprit and simply reseal/replace the affected part.

Also as Satch suggested, the switch in the AFM has been known to cause the same symptom. Try his method first since it's the easiest to test and report back.
Reply
Old Sep 26, 2015 | 06:27 PM
  #6  
misterstyx69's Avatar
Retired Moderator, RIP
Tenured Member: 20 Years
iTrader: (142)
 
Joined: Sep 2005
Posts: 25,581
Likes: 136
From: Smiths Falls.(near Ottawa!.Mapquest IT!)
is your AFM plugged in?
If it is not then the car will start but die..every time..UNTIL you get the connector on the AFM and the ECU can read it.It needs to see the AFM connected.
Reply
Old Sep 26, 2015 | 06:39 PM
  #7  
RotaryEvolution's Avatar
Sharp Claws
Tenured Member 15 Years
iTrader: (30)
 
Joined: Oct 2003
Posts: 5,107
Likes: 50
From: Central Florida
i think i'd be more concerned about the AWS port on the bottom of the snorkel that appears to be going to nowhere(spun facing forward).

it also appears it still has an AWS valve hence the 3k startup so you probably have both ends uncapped, ie a huge ******* intake leak.

but what do i know, i don't know ****.

Last edited by RotaryEvolution; Sep 26, 2015 at 06:42 PM.
Reply
Old Sep 26, 2015 | 06:51 PM
  #8  
Prediict's Avatar
Thread Starter
Junior Member
 
Joined: Jun 2012
Posts: 14
Likes: 0
From: compton
Originally Posted by misterstyx69
is your AFM plugged in?
If it is not then the car will start but die..every time..UNTIL you get the connector on the AFM and the ECU can read it.It needs to see the AFM connected.
AFM is connected. I replaced the intake cause it had a hole, but no luck.
Reply
Old Sep 26, 2015 | 07:03 PM
  #9  
Prediict's Avatar
Thread Starter
Junior Member
 
Joined: Jun 2012
Posts: 14
Likes: 0
From: compton
Originally Posted by Lyger
i think i'd be more concerned about the AWS port on the bottom of the snorkel that appears to be going to nowhere(spun facing forward).

it also appears it still has an AWS valve hence the 3k startup so you probably have both ends uncapped, ie a huge ******* intake leak.

but what do i know, i don't know ****.
Are you talking about these?
Reply
Old Sep 26, 2015 | 07:15 PM
  #10  
Prediict's Avatar
Thread Starter
Junior Member
 
Joined: Jun 2012
Posts: 14
Likes: 0
From: compton
Originally Posted by satch
There is a fuel switch inside the AFM which could be problematic. Jumpering the fuel check connector bypasses the switch. If the problem exists then the fuel switch is not the likely culprit.
How do i test the AFM?
Reply
Old Sep 26, 2015 | 10:29 PM
  #11  
RotaryEvolution's Avatar
Sharp Claws
Tenured Member 15 Years
iTrader: (30)
 
Joined: Oct 2003
Posts: 5,107
Likes: 50
From: Central Florida
Originally Posted by Prediict
Are you talking about these?
may wanna check that cap, looks like it's as old as the car.

next question, where is the AWS getting air from...
Reply
Old Sep 27, 2015 | 12:52 AM
  #12  
satch's Avatar
Moderator
Tenured Member: 20 Years
iTrader: (1)
 
Joined: Jun 2005
Posts: 11,738
Likes: 16
From: tulsa,ok.
Originally Posted by Prediict
How do i test the AFM?
Jumpering the fuel check connector?
Reply
Old Sep 27, 2015 | 09:05 PM
  #13  
Prediict's Avatar
Thread Starter
Junior Member
 
Joined: Jun 2012
Posts: 14
Likes: 0
From: compton
So after looking i found alot of open valves. I plugged up almost all of them. Now the car starts and stays on for a bit, but the idle is rough and after 20 secs it dies again.





Reply
Old Sep 27, 2015 | 09:37 PM
  #14  
RotaryEvolution's Avatar
Sharp Claws
Tenured Member 15 Years
iTrader: (30)
 
Joined: Oct 2003
Posts: 5,107
Likes: 50
From: Central Florida
Originally Posted by Prediict
So after looking i found alot of open valves. I plugged up almost all of them. Now the car starts and stays on for a bit, but the idle is rough and after 20 secs it dies again.




this bottom taped port needs to be sealed better also.

i have a strong feeling you also have leaks at the bottom injector seals and the plenum gaskets. spray carb cleaner around the intake with the engine running to find them. jumpering the fuel pump test connector may allow you to keep the engine running by feathering the throttle.

Last edited by RotaryEvolution; Sep 27, 2015 at 09:41 PM.
Reply
Old Sep 27, 2015 | 11:28 PM
  #15  
clokker's Avatar
Cake or Death?
Tenured Member 10 Years
iTrader: (2)
 
Joined: Jan 2007
Posts: 10,249
Likes: 64
From: Mile High
Hell, most of those "open valves" are water line fittings and couldn't cause an air leak.
Reply
Old Sep 28, 2015 | 06:22 AM
  #16  
RotaryEvolution's Avatar
Sharp Claws
Tenured Member 15 Years
iTrader: (30)
 
Joined: Oct 2003
Posts: 5,107
Likes: 50
From: Central Florida
Originally Posted by clokker
Hell, most of those "open valves" are water line fittings and couldn't cause an air leak.
looks like every other FC that ever came into the shop.

honestly i don't know how the **** i managed to keep doing this for 12 years without slitting my wrists.
Reply
Old Sep 28, 2015 | 09:07 AM
  #17  
satch's Avatar
Moderator
Tenured Member: 20 Years
iTrader: (1)
 
Joined: Jun 2005
Posts: 11,738
Likes: 16
From: tulsa,ok.
Originally Posted by Lyger
looks like every other FC that ever came into the shop.

honestly i don't know how the **** i managed to keep doing this for 12 years without slitting my wrists.
Other people's problems though are your financial gain. Would you rather be a Psychiatrist?
Reply
Old Sep 28, 2015 | 09:18 AM
  #18  
RotaryEvolution's Avatar
Sharp Claws
Tenured Member 15 Years
iTrader: (30)
 
Joined: Oct 2003
Posts: 5,107
Likes: 50
From: Central Florida
Originally Posted by satch
Other people's problems though are your financial gain. Would you rather be a Psychiatrist?
FC owners are cheap, that is why these cars end up like this in the first place. yes it was income but not when you're making a couple dollars when you should be making a couple hundred. i once had a car come in with an "extended harness", i started tugging on connectors and they started pulling off the harness like scabs, it's disgusting to see people think that wrapping a couple bare wires together and taping over it is 'okay', except this isn't a home theater system.

spend the time and do it right or just pour some gas on it and let it burn is my advice nowadays. pick up the proper caps, replace the injector grommets, verify the intake gaskets were cleaned properly and are sealed well. i've seen plenty of half assed gasket removals cause massive intake leaks, this all is like $50 in parts, and peace of mind is worth the effort.

but then again i'm already disgusted by why so many people feel the need to remove emissions when it plays an integral part to engine function and even power. stripping an engine like this is what created these problems in the first place, yet my warnings continue to go unheard. sure, ditch the cat but leave the rest.

if i offend anyone by saying it, too bad.

Last edited by RotaryEvolution; Sep 28, 2015 at 09:31 AM.
Reply
Old Sep 28, 2015 | 09:38 AM
  #19  
profc3s's Avatar
Junior Member
 
Joined: Jul 2014
Posts: 40
Likes: 0
From: 沖縄
^ *Preach* ^
Reply
Old Sep 28, 2015 | 10:25 AM
  #20  
Prediict's Avatar
Thread Starter
Junior Member
 
Joined: Jun 2012
Posts: 14
Likes: 0
From: compton
so I just ordered the intake gaskets(both upper and lower, why not?) and the lower injector grommets. I don't really know how to jumper connections but ill give it a try after the parts come in. Due to work I wont be able to do the work till this weekend.

hopefully that'll get me closer to having this baby up and running.

side note: as I previously stated, the previous owner did the whole EGR delete. I wouldn't have deleted it if it still had the system.
Reply
Old Sep 28, 2015 | 10:33 AM
  #21  
RotaryEvolution's Avatar
Sharp Claws
Tenured Member 15 Years
iTrader: (30)
 
Joined: Oct 2003
Posts: 5,107
Likes: 50
From: Central Florida
the fuel pump test connector is a yellow female 2 pin connector that drops off the main engine harness right by the RF strut tower, assuming it is still routed the way it was from the factory.
Reply
Old Oct 3, 2015 | 06:06 PM
  #22  
Prediict's Avatar
Thread Starter
Junior Member
 
Joined: Jun 2012
Posts: 14
Likes: 0
From: compton
So i was removing the lower intake manifold, and i notice this. Looks bad. Ahaha.

Also i broke some lines(oops), what are they called so i can replace them?





Reply
Old Oct 3, 2015 | 07:33 PM
  #23  
satch's Avatar
Moderator
Tenured Member: 20 Years
iTrader: (1)
 
Joined: Jun 2005
Posts: 11,738
Likes: 16
From: tulsa,ok.
Those are oil metering pump lines.
Reply
Old Oct 3, 2015 | 08:09 PM
  #24  
RotaryEvolution's Avatar
Sharp Claws
Tenured Member 15 Years
iTrader: (30)
 
Joined: Oct 2003
Posts: 5,107
Likes: 50
From: Central Florida
yup, so how did the gaskets look?
Reply
Old Oct 4, 2015 | 09:27 PM
  #25  
Prediict's Avatar
Thread Starter
Junior Member
 
Joined: Jun 2012
Posts: 14
Likes: 0
From: compton
Originally Posted by RotaryEvolution
yup, so how did the gaskets look?
They were old and brittle. I threw them away before i took a pic. The insides of the manifold are dirty, so ima have to spend some time cleaning it.(gasket duty anyone?)
Reply



All times are GMT -5. The time now is 10:13 AM.