KMAPRO Posted December 15, 2009 Share Posted December 15, 2009 First off 87 MJ 4.0 I noticed that when shifting through the gears, except 4th - 5th, I hear a small back pressure pop. Almost sounds like a misfire. Any one have a clue what could be causing this? Next - When sitting at a red light and the truck out of gear, I hear this light knocking, but when I push in the clutch, the sound goes away. What is this? Link to comment Share on other sites More sharing options...
jpdocdave Posted December 16, 2009 Share Posted December 16, 2009 do you have an aftermarket exhaust? Link to comment Share on other sites More sharing options...
Eagle Posted December 16, 2009 Share Posted December 16, 2009 How old is your oxygen sensor? I got a "POP" like that when mine was due for replacement. It doesn't respond quick enough when you let off the throttle to shift, and that dumps some unburned fuel through the exhaust. The POP is when it hits the cat and burns (explodes). Link to comment Share on other sites More sharing options...
Pete M Posted December 16, 2009 Share Posted December 16, 2009 does the knocking sound like it's coming from the trans? When was the last time you check the gear oil level in the Peugeot? Link to comment Share on other sites More sharing options...
KMAPRO Posted December 16, 2009 Author Share Posted December 16, 2009 No on the aftermarket exhaust. I have no clue how old the oxygen sensor is. I am betting it is the original one. This was a hand me down truck... As far as the sound when the clutch is out, I haven't checked the fluid level in it lately. I am willing to bet this might be the issue because it grinds a bit when going in second gear when I first start out. After it has warmed up a bit, it shifts smoothly. Link to comment Share on other sites More sharing options...
88mjmanche Posted December 16, 2009 Share Posted December 16, 2009 sounds like my tranny issue but mine was a bent finger on the pressure plate :dunno: Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now