Hey my 87 v6 is running really rich it burns your eyes its so rich.
I have a new ignition system new engine new fuel pump new o2 new iac, timing is correct
any ideas on what it might be, thanks ahead

Is it giving you a rich code? I assume it is if its running that rich. Mine had a similer problem and it turned out to be a broken vacuum line at the fuel pressure regulator.

------------------
Red 1988 Pontiac Fiero 3.4L V6
Black 1985 Fiero SE

no codes and i check for vacuum leaks and there are none
thanks

O2 sensor?

its new

Do you have a fuel pressure gauge that you can connect to the fuel rail to see what your fuel pressure is? Im guessing either a crushed return line or possibly a leaking/sticking injector.

------------------
Red 1988 Pontiac Fiero 3.4L V6
Black 1985 Fiero SE

[This message has been edited by 5speedsup (edited 01-03-2009).]

i might be able to get my hands on one whats the pressure supposed to be?

quote Originally posted by Byron: i might be able to get my hands on one whats the pressure supposed to be?

The specs. call for fuel pressure on the MPFI systems to be between 40.5 and 47 psi and should hold there for quite some time. If its higher then that with the engine running then its either a clogged return line or a faulty pressure regulator. If you turn the key on engine off and the pressure drops then its either a leaking injector or a faulty pressure regulator, leak in the pressure line or possibly a bad fuel pump. But since your running rich I'd bet either clogged return line or injector issues.

------------------
Red 1988 Pontiac Fiero 3.4L V6
Black 1985 Fiero SE

ya i checked today when i ran out of gas how many km i was at and i am only getting a bit more than 200km to a tank
so its sure running rich
and i wasnt able to rent a pressure gauge and i dont want to have to buy one for 60 bucks for only using a couple times
so next week i can get my hands on one at school
anyone have any ideas on what i can check until then

[This message has been edited by Byron (edited 01-04-2009).]

check ur ground straps. with the single wire o2 sensors ground is the return for the sensor.
id try adding a thick ground to the frame and battery.
if it doesnt help that then it will more than likely help many other things(preventative maint)
and ive run into hundreds of problems associated with ground
always thought it was something harder than that....
also did u use an ac/delco o2 sensor because if not then put in an ac/delco because many
people buy somethin like bosch and think its high quality so itl work better than stock. thats not true
buy an ac/delco if its not! that would be a check for sure

I have a big ground strap for neg on battery and the one that goes from engine to trunk hinge already'
and ya i dont think it was an acdelco just the cheapest one from my local parts store think it might of been bosch
i was reading some other old posts on running rich for the topic and someone mentioned they didnt have a check engine light but the coolant sensor was bad and it only showed it was bad with a scan tool plugged in,
the sensor was making the engine think it was running at -28 degrees or something low like that which was making the engine run richer
so maybe it might be something like that?
also which is the frame ground where is it located
thanks

5Speedsup hit the nail on the head. O2 sensors never cause such drastic issues as mentioned.

Definitely go back up and read 5Speedsup post again!!!

------------------
88 Coupe/full GT Conversion/3.4 getrag
06 Silverado Z71
03 Jeep TJ X
96 Sea-Ray 230 Signature...454 Chevy
03 Suzuki SV1000S

the injectors are not new but the seals are could they still leak?
but ill still check the pressure and return line out
thanks for the tips

k well i think i got a problem with the schrader valve or something cause i checked the pressure and the gauge said 0 psi which is not correct cause my car would run that crap if at all
any ideas?
thanks

A bad TPS could cause a rich burn, but it would cause it to hunt for idle speed. The Coolant Temp Sensor (CTS) could cause a very rich burn, and may not set a code. The CTS is the one underneath the thermostat housing and EGR solenoid on the V6.

bizziedude
you are right but if there is multiple problems this can be an issue. and i know that sometimes non ac/delco brand
parts send out wrong voltages.
back to the topic:
the ground strap is usually run from the top of the Y-pipe to the frame under the air filter
you can add a nice beefy strap from literally anywhere on the engine to anywhere on the frame.
all you have to do is clean the paint and grime from the connection.
hmmmmmm.
7th injector? what about it?
if could be just dumping fuel into the engine.
ok maybe a stupid question : is the strong mix smell coming from the exhuast or could it be a leak somewhere else

it does have a hunting idle that when it just goes up and down right

quote Originally posted by Byron: ya i checked today when i ran out of gas how many km i was at and i am only getting a bit more than 200km to a tank so its sure running rich

Maybe it's the air here in BC. Check my two posts at the end of This thread at the WCF of BC forum.

quote Originally posted by Byron: it does have a hunting idle that when it just goes up and down right

Yes.

thats what mine did for the longest time....
i cleaned the IAC and replaced the tps
(sensor and solenoid on the throttle body)
piece of cake.
just unscrew the two bolts to the tps and it slides right off.
and for the iac it just unscrews
the tps arm could be bent and that would cause the engine to think that the throttle is off
so it would run really rich.

hey try running in diagnostic mode.
try the aldl stuff and what not. should be a writeup on the main page..... one sec

yep
just go to the main page, then to the left side under "articles", and find "ecm trouble codes"
very useful stuff