help. i need to find this problem. ok im driving normal everything is fine. then all of a sudden my car starts to backfire and bog real bad. ok no power at all when it does this and some times i can floor it and it will go back to working fine then if i let go of the throttle it will go back to bogging. i got it scanned and i got these codes.

p0123
p0132
p0135
p0155
p0405
p0481
p0132
p0140
p0160

if anyone can give me any clue to why it is doing this please i will try anything. it is a head/cam car with lt headers uncoated. it was not doing this until recently though. please any suggestions on where to start will help.

 

Sounds like your TP sensor is bad or unpluged, and the same for your O2 sensors. Also problems with the EGR position and cooling fan circuit. That's a lot of unrelated problems, might want to make sure the PCM connectors are plugged in well and no wire harnesses have been severed or cut into. Maybe a wire bundle is getting melted on the headers . . . Is there something else you haven't told us?

 

Also look for maintenance and obvious mechanical problems - what CAL said plus more - uh, what KIND of car, mods, model year, mileage, usage,.......................

 

98 camaro
forged 346 3000 miles
tea s1.5 heads
tr230/224
hooker lt uncoated
ls6 intake
i removed the egr and left it unplugged do u think that has anything to do with it. also like i said it just started to happen one day and it only happens sometimes.

 

Hmmm, you have MANY mods, and "left it unplugged"....

Are you sure you haven'tmistaken this car for a 1965 Chevy?

Do you even have a clue as to the function of the PCM?

Not being mean, but come on, do some research or pay a pro to do it right!

 

Lot of sensors to go bad at once. Maybe a fuse out?
Dunno if there's a common point of failure but that
seems like a possibility.

Unplugged EGR could be a major vacuum leak, or a
source of excess oxygen in the exhaust, depending
on where it is "unplugged". The former would make
lean at low throttle; the latter, rich by feedback error.

 

Hey Emarky Its People Like U U Smart *** That Push People Away From This Site. I Am The One That Built The Motor And I Built The T-56 Behind Dont Lecture Me About Letting A Pro Do It ***.if U Have Nothing Helpful To Say Stay Out Of The Thread. Even Pros See New Stuff Everyday. Even Pros Ask Questions Asswipe. I Dont Care How Good U Get U Will Never Know Everything Unless We Are U Who Knows It All. Get A Life Dipshit And To All The Other People That Are Actually Trying To Help. I Really Appreciate It. That Is Why I Come To This Site Because Most People Are Helpful But U Get Ur Occasional Smart *** So To All Those Helpful And Big Texas "thank Ya"

 

The Egr Is Not Unplugged From The Exhaust I Have That Blocked Off With Some Block Off Plates That Came With My Headers. The Electrical Connector That Goes To The Egr On The Right Side Of The Intake. I Unplugged The Electrical Connector.

 

Sorry, but from your first post you seemed like a clueless noob - My fault for assuming, but YOUR fault for not explaning in detail!!!!

And, so it seems, by your intelligent and well thought out rant, I presume you know more than I, so enough said, and, to quote a famous philosopher of the last century:

"Well, Whatever, Nevermind...." K. Cobain

Have a nice day!

MRK

 

Many times when you have several electrical problems all at once that seem unrelated, the cause turns out to be a bad ground connection somewhere in the system. I'd start with the neg. battery terminal and then systematicaly check out each place where a wire ties in to the frame. Make sure the battery has a good charge on it as well and is putting out enough voltage. If all this checks out you could even have a bad PCM.

 

I think the EGR related codes are becasue you uhooked the EGR; you need to get that edited out with LS1edit. It can be a delayed reaction like that. But the other problems are unrelated.