my EXHAUST manifold does have a leak... but i was told that couldnt be causing my problem....... ???
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Power Loss, Bad Mpg, Weird Shifting
- Thread starter shaunt23
- Start date
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my EXHAUST manifold does have a leak... but i was told that couldnt be causing my problem....... ???
interesting about the sensors... mine is a 4x4 with the "auto 4wd" + "2wd high" + "4wd high" + "4wd low".... do i have the traction control sensor? or is it just the wheel speed sensors??
00YukonSLT5.3Rwd
Member
Well if your intake gaskets are leaking you have a vacuum leak, which will cause a variety of issues.
00YukonSLT5.3Rwd
Member
Do we have a tech in the group? I have a scanner, just trying to do some diagnosis. Want to know where the manifold pressures should be, maf readings, etc. Maybe a bad sensor?!?! Under light acceleration not too bad. More acceleration it loses power. Full acceleration merging it bucks going into second. Pulling a load it feels way underpowered. Cats are new, intake gaskets new, had code for knock sensors so replaced them, as well as harness, fuel pump new, fuel filter new.... so my next step is spark plugs again, they have about 40k on them. They shouldn't be bad but then again nothing lasts 100k
SHOOT... I made a big mistake... not an intake manifold leak... An EXHAUST manifold leak...
00YukonSLT5.3Rwd
Member
That wont usually cause a problem although in theory it can cause your 02s to read off slightly..
00YukonSLT5.3Rwd
Member
Just drove it to the airport to drop off my inlaws. I noticed since replacing the knock sensors, harness, and intake manifold gaskets it seems the truck is pinging. That's why I'm doing the plugs next. I had plugs go bad on me a few times before and thought clutch was slipping/Trans was going. Replaced plugs and problem solved. My 06 Ram said no plugs until 100k and I had to do them at 50k. So I will do them tonight once it cools down and take it for a run. If problem persists, I really need some tech talk on proper readings of sensor data info to see what's off causing the problem.
00YukonSLT5.3Rwd
Member
Well shaunt23, I just found my answer. Like I said earlier I just did my intake gaskets and knock sensors, along with sensor harness. While I had the intake off I cleaned the intake manifold, throttle body, and intake ports in the heads. Also cleaned the faces of the fuel injectors. It helped, but still wasn't there. Well, I got new AC Delco platinum plugs (oe replacement) and installed them yet again. I checked the gap of the ones I took out and I was shocked to find the gap was around .030 instead of the required .060. How it changed is beyond me, there was still a mark on my plug gapper from where I set the last ones to .060. Either somehow I screwed up and forgot to gap them or the gap changed back over time. All the new ones I got were around .030, I set them to the required .060 and took the truck for a drive. She has her power back. I still have a slight ping intermittent but I will say it might be the gas. Next tank I'm running brand name fuel to see if it gets rid if the ping. It pinged for a few minutes until I got a few miles into the new plugs, hit the highway and went hammer down a few times. So, I will say check your gap.
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SLCHOE
ASE Master Certified + (L1)
What is your fuel pressure under load?
hmmmm... the gap... I had the problem before I changed the plugs initially, but the problem has obviously gotten worse... I am sure my mechanic checked the gap, but maybe it has changed like yours?
honestly I am not a mechanic, but the feeling I get is that my engine struggles due to back pressure... I dont believe my problem is mechanical... It has to do with something choking the engine, that is either some sensor giving bad readings or the exhaust leak... I am going to try and do the exhaust manifold this week and see what happens.
