Bad sputter after intake gasket - JeepForum.com

Reply
 
LinkBack Thread Tools
post #1 of 18 Old 01-10-2013, 06:27 PM Thread Starter
littleyj87
Registered User
1987 YJ Wrangler 
 
Join Date: Jan 2011
Location: Winchester
Posts: 60
Bad sputter after intake gasket

The jeep is a 87 wrangler with a 2.5 tbi motor. I just got done replacing my intake/exhaust manifold gasket, as well as my exhaust manifold. I originally had a high idle around 1500 rpm before the gasket change. Now, the jeep idles awesome around 800-900 rpm, with no noticable leaks.

I took it down the road today and for into it, anything more than quarter throttle, it sputters and acts like its hitting a rev limiter.

I want to add that my EGR valve is blocked off. Block off plate on the exhaust manifold, blocked off the tube port, but left the valve attached to the intake, just plugged the vacuum port off.

I unplugged the o2 sensor to see if that would make a difference, but it did nothing.

littleyj87 is offline  
Sponsored Links
Advertisement
 
post #2 of 18 Old 01-11-2013, 12:21 AM
NonRubicon
Registered User
1990 YJ Wrangler 
 
Join Date: Nov 2009
Location: The southern armpit of California
Posts: 2,098
I'd spray the area with electrical contact cleaner (flammable but rubber and plastic friendly stuff) and see if there are any intake leaks. I'd also loosen and then re-torque the bolts in sequence. I'd also double check for exhaust leaks where you've disconnected the EGR system.
NonRubicon is offline  
post #3 of 18 Old 01-11-2013, 12:45 AM
970001zj
Registered User
1997 ZJ 
 
Join Date: Feb 2012
Posts: 2,750
Garage
sounds like detonation from bad spark plugs to me

97 zj orvis/04 wj ltd/02 lancer oz rally/85 rx7 gs
970001zj is offline  
post #4 of 18 Old 01-11-2013, 06:11 AM Thread Starter
littleyj87
Registered User
1987 YJ Wrangler 
 
Join Date: Jan 2011
Location: Winchester
Posts: 60
Ill check all of that out later on today. It feels like the computer is pulling fuel with any more than quarter throttle. I pulled the computer out last night to make sure that there weren't any burned circuits. That checked out fine. Map sensor is plugged up and the vacuum line is good too.
littleyj87 is offline  
post #5 of 18 Old 01-11-2013, 08:51 AM
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit
Posts: 22,849
You need to do the adjustments for the 2.5L. Do you have a multimeter and do you have the FSM. There are 4 critical adjustments: WOT, ISA motor, TPS, and the fuel pressure. I would also check the connection for your CTS and your IAT since they are disconnected when you do the manifold and easy to over look. Did you remove the fender to do the manifold? The middle lower bolts are $#$% to do with the fender on!
Que89YJ is online now  
post #6 of 18 Old 01-11-2013, 09:17 AM Thread Starter
littleyj87
Registered User
1987 YJ Wrangler 
 
Join Date: Jan 2011
Location: Winchester
Posts: 60
Quote:
Originally Posted by Que89YJ
You need to do the adjustments for the 2.5L. Do you have a multimeter and do you have the FSM. There are 4 critical adjustments: WOT, ISA motor, TPS, and the fuel pressure. I would also check the connection for your CTS and your IAT since they are disconnected when you do the manifold and easy to over look. Did you remove the fender to do the manifold? The middle lower bolts are $#$% to do with the fender on!
I do have a multimeter and the fsm as well. As for the Cts so you mean the coolant temp sensor? And I did not pull the fender, I removed the throttle body in order to access the bottom manifold bolts. They were a pain to get to even with removing the tb.
littleyj87 is offline  
post #7 of 18 Old 01-11-2013, 09:32 AM
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit
Posts: 22,849
Pulling the fender makes it a million times easier and only takes 20-30 minutes. It opens the whole side of the engine up. Yes, the coolant temp sensor and the intake air temp sensor. I would also do those adjustments. Check out the TPS first.
Remember to disconnect the battery any time to discobnnect a sensor to reset the ecu. A 10 Mississippi count is long enough.
Que89YJ is online now  
post #8 of 18 Old 01-12-2013, 10:05 PM Thread Starter
littleyj87
Registered User
1987 YJ Wrangler 
 
Join Date: Jan 2011
Location: Winchester
Posts: 60
Thanks for the heads up about pulling the fender! I pulled it last night to double check the manifold bolt torque. The multimeter I have is broken right now, so I'm gonna have to find another. I did unplug the tps sensor just to see if there was a change in idle, and nothing changed when I unplugged it.
littleyj87 is offline  
post #9 of 18 Old 01-14-2013, 07:03 AM
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit
Posts: 22,849
Unplugging the sensor isn't enough on the tps. You need to take a meter to it and see what the resistance is.
Que89YJ is online now  
post #10 of 18 Old 01-16-2013, 09:00 PM Thread Starter
littleyj87
Registered User
1987 YJ Wrangler 
 
Join Date: Jan 2011
Location: Winchester
Posts: 60
I got ahold of another meter and measured resistance in the tps, everything was good there. One thing I realized I forgot to mention is it is backfiring through the intake when it sputters and won't go.
littleyj87 is offline  
post #11 of 18 Old 01-16-2013, 09:56 PM
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit
Posts: 22,849
Timing anytime you backfire.

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

Mean Max pics of everything:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

How to use Google to search the forum:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

No Start:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Que89YJ is online now  
post #12 of 18 Old 01-22-2013, 05:25 PM Thread Starter
littleyj87
Registered User
1987 YJ Wrangler 
 
Join Date: Jan 2011
Location: Winchester
Posts: 60
Well its been a while since I've looked at the jeep. I got pretty busy. But I'm going to try to take a look at my cam/crank timing later on this week.

The problem has gotten a bit worse today though. I parked it outside my garage for the past few days. I fired it up to bring it into the garage, and it died on me right away. Got it started again, and any time I hit the throttle, it wants to die. Luckily with the cold idle, I could just let out the clutch without touching the gas pedal to get it in the garage.

Once I get some more time I'm going to check my timing and check my fuel pressure as well.
littleyj87 is offline  
post #13 of 18 Old 01-22-2013, 05:37 PM
pasinbuy
Registered User
1994 YJ Wrangler 
 
Join Date: Feb 2007
Location: florida
Posts: 3,902
Quote:
Originally Posted by littleyj87 View Post
it sputters and acts like its hitting a rev limiter.

I want to add that my EGR valve is blocked off. Block off plate on the exhaust manifold, blocked off the tube port, but left the valve attached to the intake, just plugged the vacuum port off.
Would you explain why the egr is blocked? The exhaust manifold blocked? How?

What is the tube port?
pasinbuy is offline  
post #14 of 18 Old 01-22-2013, 05:45 PM Thread Starter
littleyj87
Registered User
1987 YJ Wrangler 
 
Join Date: Jan 2011
Location: Winchester
Posts: 60
Quote:
Originally Posted by pasinbuy

Would you explain why the egr is blocked? The exhaust manifold blocked? How?

What is the tube port?
The exhaust manifold is blocked using the block off plate and gasket that came with the new exhaust manifold. The tube port is blocked off using a nickel grinded down a hair to seal the port, with gasket maker on the port side of it to help seal, and the tube threaded back in to seal the nickel against the hole.

I have the EGR valve still attached to the intake, with the vaccum port blocked off.
littleyj87 is offline  
post #15 of 18 Old 01-24-2013, 10:05 PM Thread Starter
littleyj87
Registered User
1987 YJ Wrangler 
 
Join Date: Jan 2011
Location: Winchester
Posts: 60
Checked the timing on the crank, its all in time still. I'm starting to lean towards my ECM since it controls all ignition timing
littleyj87 is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com 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 e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



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 Off
Pingbacks are On
Refbacks are On

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