Can any one tell me how to adjust timing easily, i have nevr done this before and have little tools.
5.7 TPI on Speed Density set up.

I want to try this as i seem to be running very rich, will it help?

The engine is pumping out a lot of brown smoke also?

Any Ideas Please....

Thanks

 

alot of smoke and running rich don't sound like a timing issue. have you checked your tps voltage, iac, or your oxygen sensor? also, vaccum leaks can wreak all sorts of havoc on an engine... i would check for broken or cracked vaccum lines as well.

apart from the smoke, how does it run? does it seem to be skipping or have a rough idle?

 

Hi Thanks for your reply...The vaccum pipes all seem okay i have not swapped the O2 sensor as this problem is from start up and idont think that sensor kicks in untill loop changes?
I am not sure how to check the IAC or TPS voltage?
Apart from smoke it revs pretty normall but does stubble a bit on idle some times it may stall due to flooding itself..
Any ideas?

Thank you

 

if you hit up the technical articles there is one on adjusting your iac and tps. as a preliminary guess i am figuring on your tps being wrong... that will cause the ecm to incorrectly add fuel due to it not knowing where the throttle position is.(i had that problem on my last camaro; she ran rich as hell because the tps sensor was damaged and reading almost 2v at closed throttle). another inexpensive sensor that could be a culprit is the coolant temp sensor, which if not reading correctly will cause the ecm to add more fuel.

you are correct.. the o2 sensor doesn't come into play until closed loop operation. i assumed this was occuring after engine warmup. sorry

has your check engine light come on?

 

I checked the TPS it was 0.55volt at rest then around 5volt with foot to floor.
I dnt no how to check the iac i willlook on tech article thank you..

Today i noticed when i had removed the emmisions system my friend had blocked of the pipe just behind the tps once this was removed the engine started fine an idled perfect with no smoke...Then around 5-6mins later it stalled and would not start i left it for 5 hours and cleaned plugs it now starts but is puffing loads of smoke again when first thing this morning it ran just like a new engine...
Strange i wish i could fins whats going on...
I have tried changing Temp sensor, Ecm, plugs,leads, Map sensor..
Could a new IAC fix my problem...
Please any help is great...

 

what pipe was blocked? if u can give us a picture or describe the location better that would be very helpful... if the hose in question is one of the ones i think it is, its one of the large vacuum lines. these need to be clear of debris and working..

 

Hi Again, Im such a dumb ****...I recently removed the Emmision system from the engine bay to tidy things up...I removed all thin pipes to the exhaust manifold and all the ugly Emmisions box etc then blocked of pipe input on the throttle body.
Now it runs like crap....I have just read at http://tpiparts.net/emissions that this will cause all sorts of problems all of which i now have..
The car will start fine then after cold start it will stall and once i get it started by de flodding it, it runs really bad with loads of smoke..
Short of putting this back which i cant due to throwing away how can i trick the ECM to thinking there is no problems?
Thanks again

 

More than likely you disconnected the PCV valve (crank case ventilator). After a short time pressure builds in the lower part of the block due to blow by (rings leaking).

There should be a thin tube that went from one valve cover to the throttle body. A vacuum is applied through a orfice (pcv valve) to suck fumes into the intake. Fresh air is supplied on the other side (other valve cover).

 

Hi yes i just checked that the valve (i take it is the little l shaped device on driver side valve cover) is in tight it had a little oily residue which i cleaned up)
Thank you for your reply..

Do you have any other ideas...

Yesterday it started okay to smoke then stalled...
This morning i started it okay but smokes realy really bad....

Any ideas please

 

umm... some of that stuff you tore off was kinda important. i highly recommend in the future starting the car after tearing stuff off BEFORE throwing said items away. for us to help you, please take a couple pictures of your throttle body, right side of engine, and left side of engine so we can see what you removed. then we can easily show/tell you what to put back or modify to get you up and running again.

i am currently running without egr and A.I.R systems and having no problems. I think you must have pulled some other (non egr/air related) lines/pipes thusly causing your issue.

 

Hi Thunder85 i will do that and take some pics tommorow and post them for you to see....
It may not be the fact the emmisions is removed but it seems the most likly, the engine had a new radiator and a clean up by hand i have studyed every inch of the engine for any kind of problem like boken pipes, wires etc etc,
Changed most common parts fornewwith no luck..
Speak tomorrow..

 

After 5 min would be about closed loop time. What shape is the O2 sensor?

 

The O2 sensor has been disconnected for 12 years i have tried hooking it back up but not check it at all.

Im not sure if this sheds any light on things that may help with the problem...
When the Emmision system was removed the pipe hole was blocked just behind the tps control...the problem started around this sort of time then...The other morning i unplugged that hole and it started fine no smoke it ran perfect untill after the cold start period then it stalled and since then if i get it started it just smokes and runs ruff..

Could the IAC control be faulty..?
Do you know were that pipe whole goes off to as i cant see the other side of it inside the throttle body?

The pipe hole is the one between the water hose and the breather pipe for the valve cover..

Thank you for your help its hard finding some body who know there stuff..

Paul

 

here's a picture of mine pre removal of all emissions crap. the two lines to the throttle body behind the tps should NOT be removed... both are required. the water line isn't important... typically we all just bypass that anyhow

 

HiThanks for the picture...like i say i have removed the vapour canisters and pipes the smog pump is still in place but nothing connected to it.
When you removed your AIR and egr what did you do with the hole behind the tps module,the top line is still connected to valve cover,the one below has nothing on it should it be blockked or do i need to run in somewere?
Thanks

 

Check your fuel pressure. My FPR crapped out and was dumping fuel into the motor. The vaccuum line was actually pulling gas into the plenum as well. This sounds like most of the problems you are having.

 

Yes i did take te FPR off to check it as i dont have a fuel pressure guage..
It was in good condition and i fitted an adjustable hosing to it to play with one the problem is fixed..
Your right though the main problem is far to much fuel is being dumped into the engine. when its running the smoke is unbearable and definatly to much fuel style smoke...

What could cause this...

Thanks

 

PA:

Try fixing the O2 sensor and wiring. Just because it ran for 12 years does not mean anything. Something has changed and you will have to find out what. We can only tell you how it is suppose to work. Not how somebody or thing changed and it still works. You are in, way over your understanding. It is all about time, money, and knowledge, pick two.

 

Hi Will try replacing the O2 ...I just removed it and cleaned it but putting a multimeter on it i cant read any thing at all so it must be broken.
Tried a new IAC still no joy.

Should i change the Knock sensor as well?

When i check for codes i get a 15 and a 43 these codes always come back even after reseting the ecm..

I have replaced the Temp sensor, Map, Ecm, Plugs, Spark leads, IAC, Rotor Arm, Dis Cap, Oil, Fresh Fuel, Ignition Module...
Only the O2 and Knock sensor left i think...

Im getting so stressed with this now...Helllllllppp

 

At Last...............I finally found the problem..
Getting desperate to find the problem i pulled all the loom tape of the ecm wiring only to find a bad join somebody had done over the years to the knock sensor wire...

So i dont get any more smoke but it does stall on me after 5 mins and refuses to start untill the next day..

Thanks every body for your help..

I have had enough for a while trying to fix this..

 

Try replacing the O2.

To check, remove from car, clamp in a vise, test between the case and the wire (on volts), add heat to end (probe end) with a small propane torch. As you heat and cool volts should rise and fall. Use differant parts of the flame for rich and lean. Note: 9 volts (checking on ohms) will likely fry the 1 volt O2.

This is a very brief explanation, use at your own risk/knowledge level. More info can be had with general searches on the net as to all the details.

Also very rich means, cat might to toasted/ plugged up.

 

Thank you for your reply,
I will try the O2 sensor.
The thing is the O2 sensor has not been connected for 12 years plus.
And the exhaust has no cat as the engine is in a Astro Van and the pipes are custom made to suit the engine and van.
I cant think what else it maybe?
Could it possibly be the Pick up Coil as it does look rusty.
Thanks

 

wow. this is in regards to a full engine transplant patient? i would not only get the o2 sensor reattached, but i would review all wiring connections. if you found one bad connection, there are probably more. frankly i would solder and shrinkwrap any splices you do find to eliminate communication and connection issues that will most likely pop up in the future

 

If the engine has been running with the O2 sensor disconnected with no codes being shown could it has some how been turned off on ECM.

As i do have a new ecm i swapped over the chip, does any modification to the ECM hold its program in the chip or the ecm itself?
thanks again

 

closed loop and proper ecm function will NOT work without a functioning o2 sensor. period.

you need to replace the evap canister. there are things you can do to go without it, but its part of your gas tank venting system, and is supposed to help your mileage (whether it does or not i don't know).

honestly, i don't mean to be a *****, but you need to sit down and do some serious reading on tpi. i highly recommend the chevy tpi fuel injection swapper's guide. with the stuff ripped off and no o2 sensor you are running a crippled ride, and it doesn't matter how many ecms or chips you throw at it. something is seriously strange with your setup, and a good understanding of how the tpi system and ecm works will allow you to better troubleshoot what is going on. you have removed things you need, and have required stuff not hooked up. the fact that it worked at all is the startling part of this whole story

 

before thisproblem appeared i knew nothing at all about how the engine worked i have read and revised every thread i can and i am learning as i go along.

The engine should be in a car called Christine....

Its so annoying once i found that broken wire it fired upgreat i was so happy i stopped it started it reved it...it was perfect then out of the blue it stalled and now when i start it the engine is puffing smoke out again....

I realise i am no pro at this and alot of you guys are i really appreciate everybody that has helped.

Mean while i will keep revising and checking what i can..Along with pumping more money into this problem.

I appreciate it should have an o2 but cant understand why it was never connected maybe due to different pipes?

I may try a new pick up coil, the air sensor next too fuel regulator and add an o2 sensor...

 

I have a 1994 Firebird that was rebuilt and modified and well let me stop there because this car upsets me... I am used to OLD School 350 and this Lt1 ECM BS. is crazy. So here is what I have done... to my lawn dart...
1994 Pontiac Firebird


Lt1 bored .030; the cam is a comp cam 230/236; Pace Setter Long Tube Headers; many MODs. Only 200 miles on Engine, 90,000 on body.


Pistons = .030
Rings = .030
Rods= .010
Main = .010
Cam specs
.510 INTAKE LIFT / DUR.@.050 .230
.520 EXHAUST LIFT / DUR. @.050 .236

Heads
Bolts
3 Angel valve job
Valves reseated
Double Springs


*New Starter
*Summit Lifter
*Seal Push Rods
*Stock Rockers
*Timing Chain Kit
*Oil Pump ¾
Crank
Gaskets & Seals
30lb. Injectors


Transmission
2200 Stall Converter
New Seals and filter
Viper Alarm system installed 2005
2-controllers
2- keys
K&N Filter and tube



This thing starts up fine runs rough smokes (to much gas) smells like fuel in exhaust. So I would say with the modifications I could get the ECM programmed. Well I purchased the darn Interface Cable and downloaded the program from tunercat website... and decided I was not smart enough to deal with the programing because I could not get the darn car to register on the program. So I gave up and now it sits there like a stump in the road. I have over 8000 into the car and would like to sell it for 5500. Or get someone to FIX MY BIG MISTAKE.

 

Okay i sorted it i was looking in wrong place turned out to be the pick up coil once changed the smoke went away and engine runs better than ever...
Thanks for all you help