emissions problems

[deadeyedennis]

ok i live in ontario and have to pass an emission test.1998 gmc safari van.it keeps failing for noppm.what is this.however i have put a complete tune up on it.plugs wires,cap,rotor.cleaned the injectors.i have been told to buy an egr valve and a cataletic converter.but it still may not pass.but i have no codes set.what should i do? thanks in advance i am new at this.so i hope i did this right...

[GMMerlin]

Originally Posted by deadeyedennis

ok i live in ontario and have to pass an emission test.1998 gmc safari van.it keeps failing for noppm.what is this.however i have put a complete tune up on it.plugs wires,cap,rotor.cleaned the injectors.i have been told to buy an egr valve and a cataletic converter.but it still may not pass.but i have no codes set.what should i do? thanks in advance i am new at this.so i hope i did this right...

Your failure was for NOX..or Oxides of Nitrogen
This is caused by excessive combusion chamber temps..I would look at the EGR valve or the passages may be clogged.
EGR reduces NOX

[deadeyedennis]

thanks for the info;i did some internet research and i went and pulled the egr valve found that the carbon was jammed so tight that the pintle was stuck..cleaned this out..going for another e-test next week..will keep you's posted..thanks again..deadeyedennis

[deadeyedennis]

well here we go again emission problems,i am not sur what to do.

[MT-2500]

Originally Posted by deadeyedennis

well here we go again emission problems,i am not sur what to do.

This old post is long dead.
Start a new post and give us all of the info you have now.
MT

[deadeyedennis]

ok round two of emission problems of my 1998 gmc safari van 4.3 litre motor.i had a problem about a year ago with no ppm problem.ok now i have brought it to 2 gm dealers and no one seams to know what the problem is.no ppms to high.i have now changed the egr valve, sea foam the intake changed the catlytic convertor complete tune up at dealer plugs wires distrbutor cap rotor,timing set, injector psi tested ok,new vac lines, new gas cap, lots of money and no fix.i am about to sell it but lve the van and don't want to but hay it's driving me nuts please help.thanks

[MT-2500]

Originally Posted by deadeyedennis

ok round two of emission problems of my 1998 gmc safari van 4.3 litre motor.i had a problem about a year ago with no ppm problem.ok now i have brought it to 2 gm dealers and no one seams to know what the problem is.no ppms to high.i have now changed the egr valve, sea foam the intake changed the catlytic convertor complete tune up at dealer plugs wires distrbutor cap rotor,timing set, injector psi tested ok,new vac lines, new gas cap, lots of money and no fix.i am about to sell it but lve the van and don't want to but hay it's driving me nuts please help.thanks

What is it doing now or not doing?
Any check engine lights?
Any stored codes?
Has the fuel pressure been tested?

[deadeyedennis]

ok i checked the fuel pressure and it checks out ok,bought a OBD2 code reader and have had it going for about 2 days.it gives p0300randon/multiple cylinder misfire,if i clear it it will give a po301 some times but most of the time will give a po304 cylinder 4 misfire detected.brought it back to dealer who said he will replace the plugs wires,cap and rotor no charge.cause he has no idea what the problem is.thought i was doing good. light came back same thing ,same codes,by now i feel like i have tested or replaced almost every thing.the dealer told me to trade it in.or don't come back cause they just don't know what else to do.they have been good to me,so i don't blame them.just need my van if any advise i do appreciate it,thanks guys

[MT-2500]

Originally Posted by deadeyedennis

ok i checked the fuel pressure and it checks out ok,bought a OBD2 code reader and have had it going for about 2 days.it gives p0300randon/multiple cylinder misfire,if i clear it it will give a po301 some times but most of the time will give a po304 cylinder 4 misfire detected.brought it back to dealer who said he will replace the plugs wires,cap and rotor no charge.cause he has no idea what the problem is.thought i was doing good. light came back same thing ,same codes,by now i feel like i have tested or replaced almost every thing.the dealer told me to trade it in.or don't come back cause they just don't know what else to do.they have been good to me,so i don't blame them.just need my van if any advise i do appreciate it,thanks guys

If you want it fixed you need to find a dealer or a good repair shop that knows what they are doing.
Any good tech/mechanic should be able to find a missfire.
Your code reader says missfire. Anyone that knows anything should be able to fix it.
Tips on finding a good repair shop.
Check around Ask around
Word of mouth.
Family friends coworkers neighbors business people and delivery people.
Mailmen and parcel delivery people get around and notice a lot of stuff.
Even a good parts house knows what shops are good and not good.
Chamber of commerce and better business bureau and city hall.
If you find a good referral to a repair shop go look them over and talk to them.
Look for a clean looking busy place with nice people running it.
Ask a few questions and ask about their qualifications and training.
Not all places have trained tech/mechanics.
If they do not find a place that does.
Even all dealers do not have all trained techs/mechanics.


Tip on going to the dealer
Ask that only a factory certified gasoline engine performance specialist work on your car.
Not all dealerships are concerned with how repairs are dispatched, and not all dealership techs bother to take advantage of the training offered by Ford (the vast majority of which is paid training). If the dealer is uncooperative, ask for your money back and call around for a dealer that will accommodate you.