'92 VX engine problem - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 12-30-2009, 03:31 AM   #1
VX trainee
 
Join Date: Oct 2007
Posts: 125
Country: United States
'92 VX engine problem

OK, my trusty VX has been having some problems the last month or so.....idles and runs fine while cold, but once it warms up, starts to miss.

We took a quick look at it, the plugs were all fouled, cleaned them and it ran OK for a few minutes and went back to missing. Have to really "nurse" it on the highway, can't get up to 60mph. FE has dropped to maybe 27mpg.

It has a transplanted D15B engine, which up to now (15,000 miles+) has been trouble-free.

Any ideas VX guys?
__________________

4bfox is offline   Reply With Quote
Old 12-30-2009, 08:09 AM   #2
Registered Member
 
GasSavers_JoeBob's Avatar
 
Join Date: Oct 2007
Posts: 698
Country: United States
Well, first clue is that it runs OK when it is cold, but messes up when it warms up. Look at some component which comes into play when the computer goes into closed loop mode. Check your computer codes, and see what they tell you.
__________________

__________________
"We are forces of chaos and anarchy. Everything they say we are we are, and we are very proud of ourselves!" -- Jefferson Airplane

Dick Naugle says: 1. Prepare food fresh. 2. Serve customers fast. 3. Keep place clean.



GasSavers_JoeBob is offline   Reply With Quote
Old 12-30-2009, 12:15 PM   #3
jmf
Registered Member
 
Join Date: Nov 2008
Posts: 129
Country: United States
O2 sensor?
__________________

jmf is offline   Reply With Quote
Old 12-30-2009, 03:23 PM   #4
VX trainee
 
Join Date: Oct 2007
Posts: 125
Country: United States
Certainly could be the O2 sensor....has the old VX sensor on it. The sensor that came with it was damaged somewhere between Canada and here.
4bfox is offline   Reply With Quote
Old 12-30-2009, 10:12 PM   #5
Registered Member
 
imzjustplayin's Avatar
 
Join Date: Dec 2011
Posts: 720
Country: United States
Well be sure to get that sensor tested before you replace it. I don't know if autozone can do it but it definitely can be tested. I've tested O2 sensors with a butane torch and multimeter but I've yet to try it on a wideband O2 sensor.http://www.youtube.com/watch?v=ItnKP-XKaZo

That says 1 wire o2 sensor, I was able to test a 4 wire (heated) o2 sensor as well doing the exact same procedure.
imzjustplayin is offline   Reply With Quote
Old 12-31-2009, 03:36 AM   #6
Registered Member
 
Join Date: Dec 2009
Posts: 32
I've neve done a test like this. Does that mean that it's OK? How would one do a 5-wire wide band?
If I don't throw a code would I conclude that mine is OK?

Dave
__________________
94 vx
93 del Sol
93 Miata
92 Prelude Si
Dave's Civic Duty is offline   Reply With Quote
Old 12-31-2009, 03:48 AM   #7
Registered Member
 
Join Date: Dec 2009
Posts: 32
4bfox,

Ever find your problem? My 94 has the same symptoms except my MPG was 37.6 on my last tank, even with the hesitation problem!

Dave
__________________
94 vx
93 del Sol
93 Miata
92 Prelude Si
Dave's Civic Duty is offline   Reply With Quote
Old 12-31-2009, 04:16 AM   #8
VX trainee
 
Join Date: Oct 2007
Posts: 125
Country: United States
Still working on it. I'm getting a 4-wire O2 sensor, which should be the right one for this engine, I'll have to modify the wiring a little to get it to work, hopefully the CEL will go away then, along with my other more recent problems.
4bfox is offline   Reply With Quote
Old 12-31-2009, 06:01 AM   #9
jmf
Registered Member
 
Join Date: Nov 2008
Posts: 129
Country: United States
I don't know if this would change as the engine heats up, but mine was running poorly until I changed the engine grounds. The old grounds were hardly functioning. It's also a cheap project and a lot of the sensors need good grounds.
__________________

jmf is offline   Reply With Quote
Old 12-31-2009, 06:56 AM   #10
Registered Member
 
GasSavers_Erik's Avatar
 
Join Date: Nov 2006
Posts: 1,027
Country: United States
Also check the coolant temp sensor- a bad temp sensor might make the ECU think the engine is still cold even after it warms up and be making the mixture too rich for a warm engine.
__________________

GasSavers_Erik is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Incorrect Milage Calcuatlion PatM Fuelly Web Support and Community News 4 07-17-2009 08:21 PM
Missing Fuelup jmonty Fuelly Web Support and Community News 3 05-27-2009 05:10 AM
Bit the bullet rikkitikkitavi General Fuel Topics 10 11-21-2007 06:36 PM
The VX for Sale XFi For Sale 12 04-15-2007 01:02 PM
Finally got some LRRs rh77 General Fuel Topics 4 10-03-2006 09:16 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 09:15 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.