p0403 Code on 1999 Tracker 1.6 l injected

[Professor]

Has anyone ever done an EGR cleaning on this Engine it is different than those that are shown here on the Forum there seems to be much more to it than the standard 1.6 L Engine.
Your Help would be appreciated.
I cleared the Code but the engine slows to below Idle and then quits.
If I keep it slightly revved up it will stay running smoothly.
Thank you
Joerg

[jtgh]

403 is misfire #3

injector bad #3
spark dead on #3 or weak.
low compression #3
or
car i running lean
or egr leak
is this 1.6L or 1.8L ,
1.6L are all about the same. 1.8l vastly diff. i see yours is 1.6L

tune up time , cap , rotor, wires. plugs.
every 50k if you want good gas mileage

[Professor]

Originally Posted by jtgh

403 is misfire #3

injector bad #3
spark dead on #3 or weak.
low compression #3
or
car i running lean
or egr leak
is this 1.6L or 1.8L ,
1.6L are all about the same. 1.8l vastly diff. i see yours is 1.6L

tune up time , cap , rotor, wires. plugs.
every 50k if you want good gas mileage

Thank you jtgh

I used a ODBII Code Reader this was my first attempt doing so and it gave me the Po403 Code.The software that came with it identified it as EGR Flow Circuit Malfunction and reading in this Forum there are a lot of people having the same problem. I had a 1995 Tracker with over 200000 km and pulled the head for an overhaul, we had to scrape out the EGR, it was completely caked.
This 1999 tracker has only 101000km on it.
The service engine light came on and a shop reset the code.
I then drove it 800km straight and the Code stayed off.
Today I unplugged the Connector of the EGR while the Car was running and replugged it but the Code 403 came on afterwards.
I reset it and it went away but now the Car will idle too low and stall.
It is a 1.6 Engine but unlike any I have seen before 16 Valves and 4 Injectors
must have been the last production before they switched to 2 litre engine.
I did not know that they had a 1.8L
Joerg

[jtgh]

excuse my dexlexia, 304 is misfire 4 and 403 is egr , sorry i should trust brain cells older than dirt. hahaha

yours is sticking open
or the VSV valve is malfunctioning.
more later , sorry for red herring. me bad



Exhaust Gas Recirculation (EGR) Solenoid Control Circuit
SAE , defined.

first, make sure main valve dont leak.
then make sure the VSV is not stuck open allowing vacuum to reach egr at idle.
that is a start.

[Professor]

Originally Posted by jtgh

excuse my dexlexia, 304 is misfire 4 and 403 is egr , sorry i should trust brain cells older than dirt. hahaha

yours is sticking open
or the VSV valve is malfunctioning.
more later , sorry for red herring. me bad



Exhaust Gas Recirculation (EGR) Solenoid Control Circuit
SAE , defined.

first, make sure main valve dont leak.
then make sure the VSV is not stuck open allowing vacuum to reach egr at idle.
that is a start.

Thank you jtgh

Wish I had a Diagram of the Engine or even better a Pictorial .The Haynes Manual I bought shows mostly the Samurai and secondly the Tracker up to
1995 and very little Details of any models thereafter.
It does not show my Engine and I have to guess which valve is which, although I have a fair idea by following the lines. What does VSV stand for?
I think I will have to Order the OEM Manual from GMC.
Its costly but.......
Nothing is a simple as the Cars of the 60's .
professor

[jtgh]

60 yah, those even had draft tubes !
i call them slicks.

mine had a manual choke ! loved it. 61 chev pu 283, 4sp. hurst.

99 trackers I lean on. not much.
but read your PM fast.

[jtgh]

sorry jargon
Vsv, this is the vacuum solenoid valves.
like the one for EVAP sys.

the link i sent,
after looking , no EGR nfo.

your egr is either vacuum operated or
is direct ECU drive.

direct is wires.
vacuum can mess up many a way.

let me know which type you have , wires or vac tubes
i have no dwg either for 99

[jtgh]

top fails
main egr tube (some are hidden some in plain site) will back with carbon.
EGR main valve packed or just sticking ,closed or open
EGR control bad in some way.
the tubing can crack from VSV to EGR.
do you have a MOD valve between EGR main> MOD >>> VSV >>> manifold nipple.?

the mod valve on 98s can go bad or its input can clog with carbon.
on 91-98 the EGR has a exhaust nipple on top, this nipple has an oriface that is
1/6" diameter, and LOVES To clog.
I DONT think you have this upper port.

those are my thoughts this night ,deep in Yucca mountain.
we dont need lights here.........

[Professor]

Originally Posted by jtgh

top fails
main egr tube (some are hidden some in plain site) will back with carbon.
EGR main valve packed or just sticking ,closed or open
EGR control bad in some way.
the tubing can crack from VSV to EGR.
do you have a MOD valve between EGR main> MOD >>> VSV >>> manifold nipple.?

the mod valve on 98s can go bad or its input can clog with carbon.
on 91-98 the EGR has a exhaust nipple on top, this nipple has an oriface that is
1/6" diameter, and LOVES To clog.
I DONT think you have this upper port.

those are my thoughts this night ,deep in Yucca mountain.
we dont need lights here.........

Thank you very much you have been most helpfull I will follow your advise and look at it. Right now it is tucked away in the Garage and I am driving a 97
swift that I just had picked up and I am preparing it for our Winter.
I have taken some Pictures of the engine and the EGR Area and will post them asp.
Thanks again
Yeah the 60's Webbers , Solex and Bings yes you guessed right MGA Porsche and Jaguar XK150 Expensive but relative simple. My thoughts right now in this frigid north with snow just around the corner
best wishes
professor

[jtgh]

webers are very cool
i even liked SU carbs,but im sick that way.

love the way they work. no flat spots either.

cheers.