Welcome to the North American Subaru Impreza Owners Club Sunday May 3, 2015
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Normally Aspirated Powertrain

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Thread Tools Display Modes
Old 04-22-2004, 06:09 AM   #1
Scooby Newbie
Member#: 54322
Join Date: Feb 2004
Default Hesistation and Popping At Low RPMs

I need some suggestions about my 93 1.8L that is hesitating, and popping at low rpms of 1k-2k. It seems when I'm not heavy on the gas it will not hesitate as much and sometimes will disappear. When I'm heavy on the gas, I get a huge loss of power from hesitation and some popping sound near the cat.(probably destroying my cat) But after the engine revs higher then 2k, the hesitation stops.

No CEL has come on. The only mod I have is a generic cone intake filter. I have new wires and new bosch platnium spark plugs. I've read another thread that Subaru's don't like bosch plugs...has anyone had hesitation due to bosch plugs?(hard to believe it's the cause) I've cleaned and checked the IAC and PCV which seem to be good.

What should the resistance range on the coil pack be?

I'm planning on checking the o2 sensor but I'm thinking it's not the problem since a CEL didn't come on.

Anyone have some ideas on what else to check? Any info or suggestions would be greatly appreciated. Thanks in advance
* Registered users of the site do not see these ads.
zxtec is offline   Reply With Quote
Old 04-22-2004, 12:30 PM   #2
Scooby Specialist
Member#: 11808
Join Date: Oct 2001
Location: Cape Coral,FL

Typical of an engine running very lean fuel mix. Dirty injectors, fuel filter, fuel pump regulater and last but not least induction air leak like a vacume hose of or intake manafold gasket or ???? EdHayes
Hayes is offline   Reply With Quote
Old 04-22-2004, 12:38 PM   #3
Scooby Specialist
Member#: 44887
Join Date: Oct 2003
Chapter/Region: NESIC
Location: ME
00 GC6


yes it definitely sounds like a lean condition. Have you checked your plug wires? You mentioned they are new but are they frayed at all? You may want to make sure all the plug boots are completely dry from any water that may have got in there and make sure the boots are on tight. Also check the coil for any water.
Nicklbrso is offline   Reply With Quote
Old 04-22-2004, 09:53 PM   #4
Scooby Newbie
Member#: 54322
Join Date: Feb 2004

Thanks guys for the suggestions. I'll be checking on those items this weekend. The fuel filter was change about a year ago.

Wires are not frayed and the sparkplug boots are clean, dry and nice and tight.

Anyone know what the resistence range for the coil pack is?

Thanks again
zxtec is offline   Reply With Quote
Old 04-22-2004, 10:10 PM   #5
Machine Age Victim
Scooby Specialist
Member#: 29961
Join Date: Nov 2002
Chapter/Region: South East
Location: my job is a hobbie to most
2008 Honda Element
1975 Triumph Spitfire


it's your front O2 sensor, you should be throwing a CEL tho
Machine Age Victim is offline   Reply With Quote
Old 04-22-2004, 10:21 PM   #6
Scooby Newbie
Member#: 54322
Join Date: Feb 2004

I was thinking its the o2 but like I said I didn't get a CEL. I will be checking that this weekend also. I really wish the car would throw a CEL so I could have something to go by.
zxtec is offline   Reply With Quote
Old 05-26-2004, 01:26 PM   #7
Shinji N
Scooby Specialist
Member#: 3987
Join Date: Feb 2001
Location: Los Angeles, CA
1999 Miata


I had the same problem in my 2001 2.5rs exactly except instead of 2000 rpm I had to go up to 3000rpm before it would drive normal, and it would STILL not accelerate like it used to.

Swapped the O2 sensor last weekend. Car is driving like it used to.

btw, I was not getting a check engine light for the O2 sensor
Shinji N is offline   Reply With Quote

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
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
08 2.5i AT pinging at low RPM when warm out... normal? SportshiftedSSM508 Normally Aspirated Powertrain 79 07-28-2013 01:45 PM
Knock at low RPMs and load fenix-silver Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 13 05-17-2010 12:51 PM
Knock at low rpm and throttle PharmCo Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 4 02-02-2004 10:28 PM
('93-'01) Little ratling at low rpm. Opinions? tonytiger Impreza Forum 8 06-14-2001 09:29 AM
Car "stutters" at low rpm smallschip Newbies & FAQs 10 03-09-2001 12:22 AM

All times are GMT -4. The time now is 12:13 PM.

Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2015 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.