V6 Discussion and questions about the base carbureted or MPFI V6's and the rare SFI Turbo V6.

89 Camaro Rs 2.8l v6 misfiring

Old 06-02-2018, 01:07 PM
  #1  
Junior Member
Thread Starter
 
Join Date: Jun 2018
Posts: 3
89 Camaro Rs 2.8l v6 misfiring

Hi i am new to this site and 3rd gens. My 89 camaro Rs has a 2.8l v6 in it and its been misfiring for the last 4 months. When its cold it runs fine but as the engine gets heated up its starts to misfire the more i accelerate. I have changed out the spark wires, spark plugs, and recentely the entire distributor. I have also replaced the TPS and the IAC. does anyone have any idea on what could be causing this problem? When we try to read the codes it says everything is fine but clearly it isnt.
CrimsonXCV is offline  
Old 06-05-2018, 08:29 PM
  #2  
Junior Member
 
Join Date: Nov 2011
Posts: 96
Re: 89 Camaro Rs 2.8l v6 misfiring

Any time you get a new vehicle it is a good idea to run some basic tests before throwing parts at a problem. Run a compression test and see if all the cylinders are faily close in readings with none below 100. Check the timing 10 BTDC with tan wire disconnected. Put a vacuum gauge and see if it has steady reading around 15. Check the fuel pressure using the test port in the rear of the plenum.
Get a factory service manual and follow the trouble shooting charts. The manual can be found on CD on ebay or amazon for about 35 dollars. It will pay for itself in no time.

Unfortunately our cars can often run poorly without leaving codes. You may see the check engine light while driving but nothing but code 12 when checking for errors.

Were the old plugs in bad or good condition?
Mark RWC is offline  
Old 06-05-2018, 10:51 PM
  #3  
Senior Member
 
Join Date: Jan 2008
Location: peterborough UK
Posts: 912
Car: 88 T firebird
Engine: 2.8
Transmission: t5
Re: 89 Camaro Rs 2.8l v6 misfiring

If it's fine when cold then it's prob on of the temp sensors not giving the right info to the ECM. Possibly staying in open loop and not going into closed loop when warmed up.
Apart from that I had a vacuum leak last year giving me a missfire , right around the upper intake manifold, took me ages to find it , make sure everything's bolted down properly.
zs&tas is offline  
Old 10-18-2018, 07:06 PM
  #4  
Junior Member
Thread Starter
 
Join Date: Jun 2018
Posts: 3
Re: 89 Camaro Rs 2.8l v6 misfiring

I ran a compressor test and everything was fine. i have had the car for two years and just started acting up back in January. It did clear up for about two weeks after i put an ignition coil and fuel filter on it. But then misfired again. some days it runs perfect and some days its ruff. Could it be in my fuel system or O2 sensor?
CrimsonXCV is offline  
Old 10-18-2018, 07:08 PM
  #5  
Junior Member
Thread Starter
 
Join Date: Jun 2018
Posts: 3
Re: 89 Camaro Rs 2.8l v6 misfiring

Also the old plugs were bad. Also when i replaced my wires with 7mm they got burnt through real quick. ended up putting 8mm on and they are still holding up.
CrimsonXCV is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
neitzelm
TPI
0
07-14-2011 11:29 PM
1crxjeff
TPI
16
06-10-2004 05:15 PM
breathment
Tech / General Engine
9
10-29-2001 01:03 PM
bad camaro RS
Tech / General Engine
1
04-23-2001 08:58 PM
90Iroc
TPI
15
02-06-2001 11:40 AM


Thread Tools
Search this Thread
Quick Reply: 89 Camaro Rs 2.8l v6 misfiring


Advertising
Featured Sponsors
Vendor Directory

Contact Us - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: