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RX7 turns over, then dies out.

Old 09-26-15, 03:37 PM
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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; 09-26-15 at 04:11 PM.
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Old 09-26-15, 03:40 PM
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Yes, it does matter. Symptom is of a large vacuum leak. Those block off plates, especially the EGR in particular, are prone to leaking.
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Old 09-26-15, 03:59 PM
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Originally Posted by DC5Daniel View Post
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.
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Old 09-26-15, 04:20 PM
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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.
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Old 09-26-15, 04:47 PM
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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.
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Old 09-26-15, 06:27 PM
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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.
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Old 09-26-15, 06:39 PM
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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; 09-26-15 at 06:42 PM.
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Old 09-26-15, 06:51 PM
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Originally Posted by misterstyx69 View Post
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.
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Old 09-26-15, 07:03 PM
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Originally Posted by Lyger View Post
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?
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Old 09-26-15, 07:15 PM
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Originally Posted by satch View Post
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?
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Old 09-26-15, 10:29 PM
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Originally Posted by Prediict View Post
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...
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Old 09-27-15, 12:52 AM
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Originally Posted by Prediict View Post
How do i test the AFM?
Jumpering the fuel check connector?
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Old 09-27-15, 09:05 PM
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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.





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Old 09-27-15, 09:37 PM
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Originally Posted by Prediict View Post
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; 09-27-15 at 09:41 PM.
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Old 09-27-15, 11:28 PM
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Hell, most of those "open valves" are water line fittings and couldn't cause an air leak.
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Old 09-28-15, 06:22 AM
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Originally Posted by clokker View Post
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.
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Old 09-28-15, 09:07 AM
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Originally Posted by Lyger View Post
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?
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Old 09-28-15, 09:18 AM
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Originally Posted by satch View Post
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.

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Old 09-28-15, 09:38 AM
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^ *Preach* ^
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Old 09-28-15, 10:25 AM
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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.
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Old 09-28-15, 10:33 AM
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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.
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Old 10-03-15, 06:06 PM
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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?





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Old 10-03-15, 07:33 PM
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Those are oil metering pump lines.
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Old 10-03-15, 08:09 PM
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yup, so how did the gaskets look?
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Old 10-04-15, 09:27 PM
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Originally Posted by RotaryEvolution View Post
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?)
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