stalling

[93vinx]

when i changed the chip it seemd like a slight amount of air pressure left the comp box

[93vinx]

car is 92 , 5 spd

[pocket-rocket]

It is generally conceived to be the fuel injectors. I have a 5-speed, and mine does it as well. I replaced the IAC and all my vacuum lines and it helped A LOT, but it will still die on occasion, wheras it used to do it at every light. I've heard the 96-97 injectors will fix this, I haev a set, but have yet to put them in.

My advice-Get new injectors, you can find 96-97 ones around, and they are a lot quieter according to pocket rocket.

I was told by jmgtp, but he already replied, lol. I was told by the previous owner of the 92 that Magnecore wires (the Competition MV85's) that he put on fixed the "phantom stalling". Also I found out that the 92 had the updated BCFA chip code on it, which would have helped even more. Another thing to check is the condition of your vacuum lines (kinda along the lines of the intake gaskets).

[93vinx]

bought a 5spd comp tail light and dipstick 65 bucks putting it in now

[Anonymous]

The Magnecor wires didn't fix it on my car, and all of my vacuum lines were replaced with the motor 8,000miles ago.

[PlatinumZ34]

My cars a 91 5 speed and it does the same thing.

half the spark plugs have been changed (yes im lazy) and none of the injectors or gaskets have been changed. Basically i've done nothing but wear out my engine mounts and make it run rougher .

Would the 97 injectors or w/e fix it? We fixed all the vaccuum lines that don't require taking apart the heads and engine.

[jmgtp]

There's no proof that the 96+ injectors will fix it. I had the same stalling issue with my 5 speed that you guys have been describing. I changed the intake gaskets (upper, lower, and assorted plastic vacuum lines that looked brittle or were cracked) and it stopped entirely. Even if the gaskets are new, if they weren't changed by you personally then theres no real way to know if the manifolds were torqued correctly so it could still be the gaskets leaking AND don't underestimate what even one bad vacuum line will do to how your engine idles/runs (even stall). I also have 97 injectors in my 91 engine. The only reason I have them is because a few of my 91 injectors were leaking down under residual fuel rail pressure when the engine is off and the 97 injectors is what I had on hand. The 97 injectors made no difference noticeable to me in how the car runs. The only difference I noticed is that they do not have that loud 'tick' that my 91 injectors had, they are quiet.

I really don't know where people are coming up with the use of 96 injectors as a fix all for stalling - especially people who haven't even tried it. I seen old TSBs and I think the injectors were on the list of things GM replaced years ago on some of the dohc motors. If thats true then your injectors - if prone to be causing a stalling issue - should have already been replaced.

-john

[PlatinumZ34]

Alright thanks. The injectors on my car are very loud, so im thinking they are the 91 ones. Although im sure i have more than one vaccuum leak and that will all be fixed when i get around to the rear bank of spark plugs. Even though its at 309,000kms it was actually a highway car for around 5 years and then garaged until i bought it in late 2002. And i've put about 10,000kms on it, i dont think the previous owner changed anything unless he absolutly needed to. Ill replace the gaskets and fix the vaccuum lines and tell everyone if that fixed it. If not I'll replace the injectors and see if that works.... since the injectors are easier to change than the sparkplugs

[Anonymous]

since the injectors are easier to change than the sparkplugs

You're being sarcastic right? Becuz you don't have to pull the upper intake manifold to change plugs...

[Juglenaut]

The only difference I noticed is that they do not have that loud 'tick' that my 91 injectors had, they are quiet.

I wonder why they made them quiet or less loud Hmmm..

I actually caught wind of this and it is mainly to reduce the likely hood that an owner would be able to pick out a bad injector, yes NOS made that sound for a reason and a very important one at that. For if the sound deadened, disappeared, or even got really loud they were well guess that it would be bad huh.

I would check into the Fuel Advance...Remember what I used to say??

Come on you know...

What controls Fuel advance??? no not a chip, no not the regulator it is a peripheral but can cause weird things.

Ahhh loooky here the map is in relation to the AC sensor Hmmm could this cause a intermittent problem I guess you be the judge.

Both the Map and the AC sensors are potentometers, could they short each other...Possible it is not impossible. Since the First lead of the AC sensor is wired in respect to the first lead of the Map and the third leads are connected and both first and third share the same node (well in respect to wiring different nodes) to the ECM, even though the variable lead is not shared does mean that one could under cut or short the other.

Oh and most cars will not throw a code of the AC sensor...

[jmgtp]

The only difference I noticed is that they do not have that loud 'tick' that my 91 injectors had, they are quiet.

I wonder why they made them quiet or less loud Hmmm..

I actually caught wind of this and it is mainly to reduce the likely hood that an owner would be able to pick out a bad injector, yes NOS made that sound for a reason and a very important one at that. For if the sound deadened, disappeared, or even got really loud they were well guess that it would be bad huh.

eh... I think they just used quieter injectors because its more 'refined'
most customers feel that the less clatter an engine makes under the hood the better

[Juglenaut]

okay like lifetime lower ball joints yeah..

Granted most just drive and pay to fix.

I am was trying to say that if a customer, if you will, picks out one that sounds horrid or can hear or feel running to be replaced when with the new ones they can say 4 of them are going or are going to be bad it is reccommended that you replace blah blah....

I am not against you, new refind, as you will, injectors do little more than souund quiet.

[pocket-rocket]

since the injectors are easier to change than the sparkplugs

You're being sarcastic right? Becuz you don't have to pull the upper intake manifold to change plugs...

Not if you have the right assortment of extensions and a swivel on hand. I never pull the plenum to change plugs, unless I am going to take it off for something else. But if he did change the injectors, then he would have to pull the plenum off, and that would be an ideal time to make it easy to change the rear plugs. Might as well do the wires too since most people that don't change the rear plugs don't change the rear wires either.

[wdowey]

stalling z34

your problem is your crank sensor......i did my coil packs and my injectors and it still didn't help...well my father inlaw said to replace my crank sensor so i did ,and it never stalled again.....i spent all that money on the injectors and coil packs,and it ended up being a $23.00 part...LOL

[grandprixgtp_91]

i doubt it, i changed my crank sensor and it didnt help at all. i think that the problem is different for every car! lol, why do we like these cars so much?

Jake