emissions

Reply Subscribe

Thread Tools

Search this Thread

Oct 1, 2003 | 01:40 PM

automech A

Thread Starter

New User

Joined: Oct 2003

Posts: 3

Likes: 0

emissions

I have a question on emissions my work truck is a 1990 f--250 with a propan fuel system . it failed NOx can any one give any help in this matter

-All caps removed by admin-

Oct 1, 2003 | 05:47 PM

Torque1st

Posting Legend

Joined: Sep 2001

Posts: 30,255

Likes: 37

Hello-

Moved to proper forum, tech is not allowed in General Conversation. Please read the forum headings and notices posted in each forum.

Oct 1, 2003 | 06:00 PM

90f150moneypit

Posting Guru

Joined: Jan 2003

Posts: 1,061

Likes: 0

From: Still under the hood in O

How does it run? How old are the cat converters?

Oct 2, 2003 | 05:58 AM

automech A

Thread Starter

New User

Joined: Oct 2003

Posts: 3

Likes: 0

The truck runs great as far as i know the cat is the orig. one

Oct 2, 2003 | 11:17 AM

jimandmandy

Post Fiend

Joined: Jun 2001

Posts: 5,228

Likes: 5

From: Running Springs CA

NOX is usually an EGR issue. Check there first.

Jim

Oct 2, 2003 | 02:00 PM

gasman6674

Posting Guru

Joined: Apr 2002

Posts: 1,471

Likes: 3

From: Greenwood In. USA

How about a little more Info. Engine size, mileage, recent repairs etc. If it failed Nox did they give you the other readings? Like CO. Is the truck dedicated or bi-fuel and does it have any support/timing adjustment boxes on it. I have worked in the lp industry for a long time hopefully I can help.
Regards

Oct 16, 2003 | 06:54 AM

automech A

Thread Starter

New User

Joined: Oct 2003

Posts: 3

Likes: 0

The truck is dedicated, it is a stright six fuel ing ,it passed the other reading hc>1.3744gpm,co>10.0029gpm. Put the nox failed at 6.2851gpm. At this time i dont no if it has a any timing ajustment box on the system , were would it be and what does it look like we were given this vech, by the old company and no info on the fuel system was given to me i could not even tell you make its or who put it in .

Trending Topics

Another Crank no start -- sorry

26

441
Odd knock/rattle at idle only after fully warmed up

27

428
My 1976 F-250

3.9k

263.3k
This is prolly a 1 page thread at most

110.3k

6M
Automatic and Manaul TPS the Same?

20

319

Oct 16, 2003 | 12:14 PM

flanker

New User

Joined: Sep 2003

Posts: 13

Likes: 0

I agree that NOx is most likely an EGR issue. Pull the codes to see if you have any EGR/EVR related issues. First check you vacuum connections (to EVR, and from EVR to EGR). Next check your EGR diafragm to make sure it moves up and down and holds the vacuum. Also check your EVR solenoid to make sure it has proper resistanse (I think it should be between 40 and 60 Ohm) and is not stuck closed or open. If you have an EVR adapter connector that looks like a little black box between the wiring harness and the EVR, check it too. It has a resistor inside that might have lost connection.

Also, if your oxygen sensor never been changed, change it. It helps emissions enourmously.

HTH,
flanker