Intake popping...help??
#1
Seasoned Member
Thread Starter
Join Date: Nov 2009
Location: NJ
Posts: 301
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1999 sport 4x4
Model: Cherokee
Engine: 4.0L
Intake popping...help??
I have 97 4.0 xj, when cold, the engine sumbles a little and pops out of what sounds like the intake, my issue is gone when I floor the gas...usually goes away within a mile...but at full temp...if I turn it off for a few minutes...it will pop again a little for a minute or two....once in a blue moon at idle it fluctuates , but only rarely....I put on a 99 intake, mustang injectors, accell plugs cap and wires and just had the head redone with new seals...I also put on a header...conical air filter....new o2's...also ,,,I have a NSS code and I installed a new NSS...but I think someone bypassed it as if I unplug it it still operates 100%..lights starts in each gear and all...not sure where its jumped...its not at the plug areas...I see nothing on the computer on the fender...will this add to it?
Thanks!!!
Thanks!!!
#2
Senior Member
Join Date: Oct 2011
Location: Longview, TX
Posts: 689
Likes: 0
Received 2 Likes
on
2 Posts
Year: 1998
Model: Cherokee
Engine: 4.0L
I get the same popping noise accompanied with a stumble from time to time. If I let off of the accelerator for a second and then get back on it, the noise and power loss are gone. Interested to see what everyone thinks.
#3
Member
Join Date: Jul 2012
Location: Louisville, KY
Posts: 226
Likes: 0
Received 0 Likes
on
0 Posts
Year: 94
Model: Cherokee
Engine: 4.0 I6
#4
CF Veteran
Join Date: Nov 2010
Location: some small town oregon
Posts: 15,581
Likes: 0
Received 8 Likes
on
8 Posts
Year: 1989
Model: Cherokee
Engine: 4.0
Originally Posted by 2doors
timing might be a little off.. it's easy to mess the timing up when putting the head back on.
Only way to screw timing up would be to mess up the plug wires and that would not go away when it warms up.
#6
Senior Member
Join Date: Oct 2011
Location: Longview, TX
Posts: 689
Likes: 0
Received 2 Likes
on
2 Posts
Year: 1998
Model: Cherokee
Engine: 4.0L
Originally Posted by jomps
if its popping at intake pretty sure its running lean, any cels
Trending Topics
#8
Seasoned Member
Thread Starter
Join Date: Nov 2009
Location: NJ
Posts: 301
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1999 sport 4x4
Model: Cherokee
Engine: 4.0L
the firing order and wires are straight....the only CEL code is p1899 for NSS. I was thinking vaccum leak? but where? the none used vac ports are capped off... and as far as the NSS what would a bypass look like...butt conn? thanks
#10
Seasoned Member
Thread Starter
Join Date: Nov 2009
Location: NJ
Posts: 301
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1999 sport 4x4
Model: Cherokee
Engine: 4.0L
#12
Seasoned Member
Thread Starter
Join Date: Nov 2009
Location: NJ
Posts: 301
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1999 sport 4x4
Model: Cherokee
Engine: 4.0L
OK now I am getting code p1302 in addition maight have been a P1320 a little dislexic..the one for the distributor....any thoughts are welcome///
Last edited by DaveD; 07-18-2012 at 07:30 AM.
#14
CF Veteran
Join Date: Jun 2009
Location: Columbus, Ohio
Posts: 2,173
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1997
Model: Cherokee
Engine: 4.0, comp cam, 99 intake, apn header, neon injectors, Thunderbolt 2.5" High Flow Cat
stop using Bosch o2 sensors... get NTK's in there. Bad o2 sensors CAN make your jeep run lean. also, your code sounds like a weak spark or bad Crankshaft position sensor.
#15
i dont see where he mentined Bosch; but Bosch makes great parts. in fact theyre OEM parts for a LOT of different car makes. at any rate; hes on his 3rd o2 sensor with no change; its going to be a waste of time and money to replace it again.