GalantVR4.org The Mitsubishi Galant VR-4 Forum
Galant VR-4 Forums » Galant VR-4 » Technical Discussions » engine hiccups under load
Previous thread Next thread

engine hiccups under load


Jesh
Member +
898/1000


Galant VR-4 org Post #: 978041 posted 03/19/11 05:57 PM     Remind Me!  Send Private Message   Edit Post      
I've had this problem a long time and would really like to get rid of it so I'm open to idea's. Anyways here is the problem... My car will drive absolutely perfect under all conditions and temperatures. But when I roll on the throttle fairly quickly as soon as the turbo spools and the car starts to pull, the engine will act like its hitting a fuel cut and lose power for about half a second. Then it will come back to life and with a fairly harsh jolt. If I slowly increase the rpms it will pull smoothly all the way to redline. This condition only seems to be a problem when the engine is under heavy load. Thanks in advance guys.

setup:
fuel pressure: stock
afr: under load 10.0- 10.5:1 (possibly to rich and flooding the engine?)
boost: 16psi
intake: stock with k&n filter
spark plugs: played around with different plugs and gaps but nothing helped, currently running bpr7es gapped at .28
ecm and electronics: none bone stock, checked the caps a month ago and they looked good, but I'm not ruling them out.

Once again... I'm open to idea's.



'92 Galant VR4 898/1000
'91 Galant GSX - parts
'93 Laser RS - gone

Posts: 281 | From: Soldotna, Alaska | Member Since: 11/12/09 | IP: (66.230.113.47) | Report this post to a Moderator

Garfield Wright
Unregistered


Galant VR-4 org Post #: 978044 posted 03/19/11 06:07 PM     Remind Me!  Send Private Message   Edit Post      
That's really rich & most likely the main cause of the problem. You also want to switch back to some #6 plugs & gap it about 24. No need to run 7's with your stock setup. You could also turn up the boost to ~18 psi. However do one thing at a time.

In this order - Plugs
Drive it, log it. If all is well then your done, otherwise move onto the next step.
Turn up the boost. This will help to lean it out a little.


Edited by Garfield Wright (03/20/11 04:31 PM)

| | | IP: (66.229.166.41) | Report this post to a Moderator

Jesh
Member +
898/1000


Galant VR-4 org Post #: 978061 posted 03/19/11 07:19 PM     Remind Me!  Send Private Message   Edit Post      
I like the second suggestion
But I'll go ahead and give the plugs a try first.



'92 Galant VR4 898/1000
'91 Galant GSX - parts
'93 Laser RS - gone

Posts: 281 | From: Soldotna, Alaska | Member Since: 11/12/09 | IP: (66.230.113.47) | Report this post to a Moderator

Jesh
Member +
898/1000


Galant VR-4 org Post #: 978071 posted 03/19/11 07:57 PM     Remind Me!  Send Private Message   Edit Post      
Well I tried the plugs and nothing changed. So I turned up the boost to 18psi afr went to 11.0-11.1:1 but the problem is still there. Any more ideas?



'92 Galant VR4 898/1000
'91 Galant GSX - parts
'93 Laser RS - gone

Posts: 281 | From: Soldotna, Alaska | Member Since: 11/12/09 | IP: (66.230.113.47) | Report this post to a Moderator

SouthCaliVR4
Gas Analyzer
825/2000


Galant VR-4 org Post #: 978091 posted 03/19/11 09:04 PM     Remind Me!  Send Private Message   Edit Post      
check plug wire for arcing in the plug well.

How to do this. first pop the wires out & give the boots a visual, sometimes you can straight see the burn holes. Then put them back in but do not push them down to lock. start the car, pull up one wire at a time & watch the boot for any sparking other than just out the end. I do this by rolling the boot on the v/c. Any & I mean any arcing not coming from the hole on the end & the wire is bad. Lower light conditions help.



How do you make a small fortune racing? Start with a very large one!!!

Posts: 984 | From: North county San Diego | Member Since: 07/31/10 | IP: (76.176.152.126) | Report this post to a Moderator

1990ggsxnj
Member ++
1578/2000


Galant VR-4 org Post #: 978203 posted 03/20/11 01:42 AM     Remind Me!  Send Private Message   Edit Post      
Could also be a boost leak causing the fuel cut.



"Is that Spool Drool? EWW!"
90GGSX Blue-Chesapeake
91GVR4 Nile Black-Sidney (Sid)

Posts: 525 | From: Blackwood, NJ | Member Since: 11/21/08 | IP: (69.244.106.85) | Report this post to a Moderator

Jesh
Member +
898/1000


Galant VR-4 org Post #: 978387 posted 03/20/11 07:21 PM     Remind Me!  Send Private Message   Edit Post      
Okay so I checked the spark plug wires and they look good. I also just did a boost leak test and nothing is leaking. I know either the fuel is cutting out or the spark, I'm just not sure how. Anymore ideas guys?



'92 Galant VR4 898/1000
'91 Galant GSX - parts
'93 Laser RS - gone

Posts: 281 | From: Soldotna, Alaska | Member Since: 11/12/09 | IP: (209.193.50.152) | Report this post to a Moderator

mitsuturbo
Banthony
555/1000


Galant VR-4 org Post #: 978388 posted 03/20/11 07:26 PM     Remind Me!  Send Private Message   Edit Post      
This is really a short in the dark, but do you have a factory VR4 maf, and not a DSM maf? FPSolenoid still being used, if so, is it working right? Is your BOV vented to atmosphere?



92 GVR4 555/1000 11.41 @ 128.26mph
97 CBR900RR
2012 Hyundai Veloster

Posts: 3535 | From: Near Seattle, Washington | Member Since: 06/02/08 | IP: (98.237.214.181) | Report this post to a Moderator

Jesh
Member +
898/1000


Galant VR-4 org Post #: 978395 posted 03/20/11 07:45 PM     Remind Me!  Send Private Message   Edit Post      
I'm using the stock maf. fuel pressure solenoid is still being used, I don't know if it is working correctly or not. and my bov is recirculated into the intake. ... just realized something. I'm using a stock 1g ecm, not the original vr4 ecm. Could this be causing the hiccup?



'92 Galant VR4 898/1000
'91 Galant GSX - parts
'93 Laser RS - gone

Posts: 281 | From: Soldotna, Alaska | Member Since: 11/12/09 | IP: (209.193.50.152) | Report this post to a Moderator

PreskitVR4
Member +
501/2000


Galant VR-4 org Post #: 978655 posted 03/21/11 11:01 PM     Remind Me!  Send Private Message   Edit Post      
My forehead just healed up from this brickwall of an issue. Mine was actually pretty stupid, it was loose pins in the ECU connectors. I was running a DSM ECU, with it laying on the floor. Everytime I would boost the ECU would stand up, pulling on the connectors. It was very violent but exactly as you described.



"Hey your the guy with the.....the B13 Sentra?"

Posts: 272 | From: Prescott, Northern AZ | Member Since: 06/28/08 | IP: (24.121.224.29) | Report this post to a Moderator

PreskitVR4
Member +
501/2000


Galant VR-4 org Post #: 978657 posted 03/21/11 11:04 PM     Remind Me!  Send Private Message   Edit Post      
Wow I just read your last post. Duh. Swap the board out of the 1g case into your GVR4 case, reinstall into factory location



"Hey your the guy with the.....the B13 Sentra?"

Posts: 272 | From: Prescott, Northern AZ | Member Since: 06/28/08 | IP: (24.121.224.29) | Report this post to a Moderator

Jesh
Member +
898/1000


Galant VR-4 org Post #: 978714 posted 03/22/11 01:34 AM     Remind Me!  Send Private Message   Edit Post      
My ecm is mounted in the glove box with velcro, it doesn't move much at all. But I'll definitely check on the connector pins.



'92 Galant VR4 898/1000
'91 Galant GSX - parts
'93 Laser RS - gone


Edited by Jesh (03/22/11 01:38 AM)

Posts: 281 | From: Soldotna, Alaska | Member Since: 11/12/09 | IP: (216.67.116.128) | Report this post to a Moderator

Justin
Unregistered


Galant VR-4 org Post #: 979617 posted 03/24/11 09:15 PM     Remind Me!  Send Private Message   Edit Post      
Look at the injector clips and make sure they are properly seated on the injector.

| | | IP: (74.82.64.35) | Report this post to a Moderator

Jesh
Member +
898/1000


Galant VR-4 org Post #: 998939 posted 06/12/11 12:22 AM     Remind Me!  Send Private Message   Edit Post      
Update: I installed a eprom ecu with ecmlink v3 and the hiccup is completely gone. Wish I could've figured out exactly what the problem was though...



'92 Galant VR4 898/1000
'91 Galant GSX - parts
'93 Laser RS - gone

Posts: 281 | From: Soldotna, Alaska | Member Since: 11/12/09 | IP: (66.230.105.39) | Report this post to a Moderator

656of1000
You can't put a price on childhood memories
656/
1000


Galant VR-4 org Post #: 999447 posted 06/14/11 03:38 PM     Remind Me!  Send Private Message   Edit Post   
... maybe the caps were leaking in the original ECU?

I had a similar problem. And even though you fixed your problem, I'd like to share in case others look at this thread for answers for their own problems. My plug wires were bad, and although they looked fine when I inspected them, they would arc under heavy load. If your wires are more than a few years old, just pop in a new set. Even if its not the problem, its still a good thing to do. I've had excellent luck with the blue NGK wires.



Mark I.

1992 Galant VR4 656/1000
2004 Mazda RX-8
1988 Escort GT Turbo
1987 Ranger STX
2002 Subaru Impreza Outback Sport

Posts: 292 | From: Phoenixville, PA | Member Since: 01/18/05 | IP: (68.80.78.92) | Report this post to a Moderator


Pages: 1
Previous thread Next thread

Extra information
0 registered and 9 anonymous users are browsing this forum.

Galant VR4.org Moderator:  curtis, steve, atc250r, jcgalntvr4-244, cheekychimp, jepherz, Rausch, toybreaker, iceman69510, pot, FlyingEagle 

Print Thread

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled

Rating:
Thread views: 8154

Rate this thread


News & Events: News | Events
Galant VR-4: Newbies | General VR4 Discussions | Technical Discussions | How To and Info Archive
Marketplace: Parts For Sale | Cars For Sale | Good Guys | Bad Guys
Community: Members' Showcase

Contact Us | Privacy statement GalantVR-4.org

Generated in 0.101 seconds in which 0.069 seconds were spent on a total of 14 queries. Turbo powered.


Hertz's Galant VR-4 Page