1998 3800 wont rev past 2500 rpm - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

 
LinkBack Thread Tools Display Modes
post #1 of 10 (permalink) Old Aug 5th, 09, 07:23 PM Thread Starter
 
Join Date: Aug 2009
Posts: 6
1998 3800 wont rev past 2500 rpm

i have a camaro with the v6 3800 i changed the fuel filter cleaned maf and fuel press reg was ok put in a new coolent sncr the car ran like crap this morning but i check the fuel reg put it back together it ran fine went to town put the ac on it all started over again this time i have no cure can i please get some help
tiawahjack is offline  
Sponsored Links
Advertisement
 
post #2 of 10 (permalink) Old Aug 5th, 09, 07:42 PM Thread Starter
 
Join Date: Aug 2009
Posts: 6
1998 3800 wont rev past 2500 rpm

i checked and cleaned maf sncr changed fuel filter checked fuel press regulator checked for vac leaks im stumped it ran great for about an hour today then i turned the ac on it all went down hill been messed up sence oh i replaced thermo scnr on the front of the motor under maf scnr and new gas
tiawahjack is offline  
post #3 of 10 (permalink) Old Aug 5th, 09, 07:54 PM
Senior Tech
Steiner
 
Join Date: Mar 2009
Location: Lyman, SC
Posts: 8,348
Re: 1998 3800 wont rev past 2500 rpm

If you've been working with the fuel system or had a bad coolant sensor to start with and possibly got a lot of fuel through it, it sounds like the catalytic converter. A bad coolant sensor will often make it run rich. Will it not rev past 2500 in park, in gear, or both? Does it idle fine and run fine up until you hit a certain RPM? A failed catalytic will stop the exhaust up so it can't rev up under load.

I had a truck once that the rotor went out in the distributor while I was traveling between Statesboro, GA and Nashville, TN. I had to leave it at a dealership in Atlanta and get a company car to get to Nashville. Luckily, my company was in Atlanta. The dealership called me and told me that the computer was telling it to dump too much fuel in because they pulled a spark plug and it was pumping fuel out of the cylinder. I asked him, "Doesn't that sound like no spark? Why don't you try changing out the cap and rotor?" Unbelievable. So, they changed those out and it ran. When I was able to pick it up, it wouldn't rev past 3000 because all the raw fuel they pumped through it while monkeying around melted the converter and the exhaust couldn't flow.

So, long story short (too late), sniff the exhaust. If it smells like rotten eggs, it's the catalytic converter. Mine didn't really smell though so who knows.

'69 Camaro
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
500hp/538lbft

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

'69 Camaro Beater-SFT 327-M20-Moser 4.10-sold
'02 Z/28 vert-stock-sold and totaled
Steiner is offline  
 
post #4 of 10 (permalink) Old Aug 5th, 09, 08:00 PM Thread Starter
 
Join Date: Aug 2009
Posts: 6
Re: 1998 3800 wont rev past 2500 rpm

thanks for the repli iwill c about the cat in the morn it starts and idles fine revs up to 2500 and then bogs down wont rev any higher same n park or in gear
tiawahjack is offline  
post #5 of 10 (permalink) Old Aug 5th, 09, 09:03 PM
Senior Tech
Dale
 
Join Date: Sep 2000
Location: Glendale,AZ.U.S.A.
Posts: 966
Re: 1998 3800 wont rev past 2500 rpm

Check engine light on? If so what codes? How much fuel pressure?
Does it run well up to 2500rpm?

68 Dana 302, 68 rs 327 daily driver/family car, 71 rs, track car/ driver, 68 firebird 400, 70 formula 400, 73 type LT, 98 TA, 2 goofy kids and an incredible wife.
dale68z is offline  
post #6 of 10 (permalink) Old Aug 5th, 09, 09:39 PM
Senior Tech
 
Join Date: May 2001
Location: Ashby,MN, USA
Posts: 8,305
Re: 1998 3800 wont rev past 2500 rpm

could be that the switch on the shifter or trans or wherever that tells it what gear it's in might have gone bad or out of adjustment. they are set up with a rev limiter for when the car is in park.

you don't plan sincerity.
you have to make it up on the spot.

wanna hear about 20 years ago when i was too smart to know any better?
novaderrik is offline  
post #7 of 10 (permalink) Old Aug 5th, 09, 10:21 PM Thread Starter
 
Join Date: Aug 2009
Posts: 6
Re: 1998 3800 wont rev past 2500 rpm

thanks for the repli there is no codes and its not throwing any i have a tech2 reader that i keep looking for codes with wishing it would throw a code so i got a place to start not sure about fuel pressure i will check it to in the morn i got a chiltons book to c what the pressure pose to be thanks again
tiawahjack is offline  
post #8 of 10 (permalink) Old Aug 5th, 09, 10:33 PM Thread Starter
 
Join Date: Aug 2009
Posts: 6
Re: 1998 3800 wont rev past 2500 rpm

thanks for the repli i will check into that but its not rev limiter sound this just loads up bad rev it up to 2500 bogs let off throt and rev again it goes up to 2400 and then 2300 another thang when i turn a/c on the rpm surge down and about 400 rpms
tiawahjack is offline  
post #9 of 10 (permalink) Old Aug 6th, 09, 02:52 PM Thread Starter
 
Join Date: Aug 2009
Posts: 6
Re: 1998 3800 wont rev past 2500 rpm

fixed it we have a winner it was the cat conv thanks for your help
tiawahjack is offline  
post #10 of 10 (permalink) Old Aug 6th, 09, 06:41 PM
Senior Tech
Steiner
 
Join Date: Mar 2009
Location: Lyman, SC
Posts: 8,348
Re: 1998 3800 wont rev past 2500 rpm

Quote:
Originally Posted by tiawahjack View Post
fixed it we have a winner it was the cat conv thanks for your help

Cool! You're welcome.

'69 Camaro
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
500hp/538lbft

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

'69 Camaro Beater-SFT 327-M20-Moser 4.10-sold
'02 Z/28 vert-stock-sold and totaled
Steiner is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome