Hello! Log in or Register   |  Help  |  Donate  |  Buy Shirts See all banner ads | Advertise on TheSamba.com  
TheSamba.com
 
1993 Eurovan starts running rich at 23.5 mph
Forum Index -> Eurovan Share: Facebook Twitter
Reply to topic
Print View
Quick sort: Show newest posts on top | Show oldest posts on top View previous topic :: View next topic  
Author Message
jbclem
Samba Member


Joined: November 04, 2011
Posts: 165

jbclem is offline 

PostPosted: Sat Jun 09, 2018 5:06 pm    Post subject: 1993 Eurovan starts running rich at 23.5 mph Reply with quote

My neighbor's 1993 Eurovan won't pass smog. The mechanic replaced the O2 sensor but that didn't help. He took it to another mechanic who ran it on a dyno and discovered that it started running rich at 23.5 mph. Suspecting a defective computer, they tried a used computer (the correct part number) and that didn't make any difference. They still suspect the computer but no one wants to buy a new one and have to eat it if it doesn't fix the problem.

The HC is at 200, the CO at 5.5. The 5v signal is at 4.75v.

This car was towed to the original mechanic for a blown head gasket(it was purchased (sight unseen) for a low price because of this), so there is no history on it, and I wonder if there might have been something done (wires mixed up?) during the head gasket repair that is causing this problem.

Can someone suggest possibilities, places to look for this kind of problem. Any particular wires that could have been switched during the repair? Right now the mechanic is stumped and I'm trying to help out.

John
Back to top
View user's profile Send private message Send e-mail Gallery Classifieds Feedback
postjosh
Samba Member


Joined: November 20, 2017
Posts: 135
Location: NYC
postjosh is offline 

PostPosted: Sat Jun 09, 2018 9:19 pm    Post subject: Re: 1993 Eurovan starts running rich at 23.5 mph Reply with quote

i’m no expert but did anyone check the pcv valve?
_________________
'93 EV Wkndr – 5 cylinder – 5 speed - 280k+ miles
Back to top
View user's profile Send private message Gallery Classifieds Feedback
Abscate Premium Member
Samba Member


Joined: October 05, 2014
Posts: 22568
Location: NYC/Upstate/ROW
Abscate is offline 

PostPosted: Mon Jun 11, 2018 3:49 am    Post subject: Re: 1993 Eurovan starts running rich at 23.5 mph Reply with quote

You need someone who can monitor injections length and o2 sensor voltage, not just throw parts. The time spent seeking out this expertise will be well spent. Find someone local who does tunes and see if they know VAG stuff.
_________________
.ssS!
Back to top
View user's profile Send private message Gallery Classifieds Feedback
markcm2
Samba Member


Joined: September 02, 2015
Posts: 505
Location: Bellingham, Washington
markcm2 is offline 

PostPosted: Mon Jun 11, 2018 8:53 am    Post subject: Re: 1993 Eurovan starts running rich at 23.5 mph Reply with quote

My go-to for fueling issues is a MAF check.

I cannot recall if a MAF signal was visible on the 1993 but generally speaking, a 3rd gear hard pull should result in a grams/second reading of about 80% of the vehicles rated horse power. VAGCOM has a logging function for this. My method is to find a high visibility freeway on ramp, have someone start the recording and accelerate hard through 2nd and 3rd providing it is safe to do so, then check the recording to see your peak g/s.

Coolant temperature sensors are also known for causing issues with fueling, another function you can see (open vs closed loop) on later vehicles but may not be available on OBDI of the 1993. Coolant sensors are usually only about $15.
Back to top
View user's profile Send private message Gallery Classifieds Feedback
volkybus
Samba Member


Joined: November 03, 2013
Posts: 480
Location: CASTLETON VT USA
volkybus is offline 

PostPosted: Tue Jun 12, 2018 3:31 am    Post subject: Re: 1993 Eurovan starts running rich at 23.5 mph Reply with quote

Does it foul plugs? Have u checked the fuel pressure? Bill
Back to top
View user's profile Send private message Classifieds Feedback
volkybus
Samba Member


Joined: November 03, 2013
Posts: 480
Location: CASTLETON VT USA
volkybus is offline 

PostPosted: Mon Feb 04, 2019 8:30 pm    Post subject: Re: 1993 Eurovan starts running rich at 23.5 mph Reply with quote

volkybus wrote:
Does it foul plugs? Have u checked the fuel pressure? Bill
Back to top
View user's profile Send private message Classifieds Feedback
Display posts from previous:   
Reply to topic    Forum Index -> Eurovan All times are Mountain Standard Time/Pacific Daylight Savings Time
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum

About | Help! | Advertise | Donate | Premium Membership | Privacy/Terms of Use | Contact Us | Site Map
Copyright © 1996-2023, Everett Barnes. All Rights Reserved.
Not affiliated with or sponsored by Volkswagen of America | Forum powered by phpBB
Links to eBay or other vendor sites may be affiliate links where the site receives compensation.