Problems after dod delete

[Justin Yeager]

07 tahoe 5.3 flex fuel had p0306 turned out lifter failure and ate lobe on cam. 178000 miles, guess this is common. Ordered dod delete from ams racing that came with tune just had to send them computer. Replaced cam with non dod truck cam, replaced lifters and trays, valve seals, replaced with new valley cover plate with oil block offs, new melling oil pump, new metal intake gaskets, head gaskets, new plugs, new cats both sided, wires, cleaned tb, got pistons looking near new again, cleaned everything very well put all back together and no start. Replaced cam sensor and it fires right up. When I was inspecting parts on install I noticed old cam sensor looked cracked but wanted to hear run so I said screw it and tried it. Now for the problems, I get p0101 when cruising, p0106 after warm up when idling and p0068 when ******* the pedal. When p0068 shows up it goes into reduced power mode. Truck runs great until codes show up. I've tore it down to cam twice since rebuild to check everything and all is good. New ac delco maf, new delphi map sensor, what a waste of money lol. I didn't replace timing chain or gears because all is within spec and looks good. I have toque and fuel trims look alright, have sprayed starting fluid on entire engine with no change in fuel trims. Mechanic says it's in the tune. Any suggestions? I contacted ams racing and they suggest intake leak but cannot find one. Sorry for the long post and thx in advance justin.

 

[Justin Yeager]

When cold start like now in mi it's around 10 to 20 degrees in morning when start and it stumbles on startup for 2 seconds then clears right up. Does show p0300 but goes right away. Checked witch one's are misfiring and it's totally random. Checked plugs and they all look fine. S0 many different codes im scratching my head lol. Service brakes soon showed up after install to. Fluid is fine pads are good as well.

 

[kbuskill]

Was the new MAF and MAP sensors replaced just because of all the work being done or was it done afterwards because of the codes???

I would also check all your grounds to make sure they are clean and tight.

 

[Justin Yeager]

Sry for the delay in response, im at work. The parts were replaced after the work. I've cleaned the ground under driver seat on Frame rail, cleaned the ground on passenger head, cleaned and replaced braided ground from firewall to block. Even tried the old maf and map sensor with no change

 

[kbuskill]

What do your LTFTs look like???

 

[Justin Yeager]

Bank 1 is around -1 percent bank 2 Is +4. That's what I remember I will check for sure on my way home tonight. Maybe some screen shots

 

[Justin Yeager]

Some screen shots while cruising at 55mph

 

[kbuskill]

Some screen shots while cruising at 55mphView attachment 214183 View attachment 214184

It is definitely running lean based on, not only the LTFTs but also, your exhaust temps.... not a good place to be... remember, lean is mean.

What say you James?... @swathdiver

 

[swathdiver]

Seems to me you have a leak in your air intake between the throttle body and air cleaner. Assuming your engine temperature was over 140 in the above readout and idling, your MAF reading is right at the upper limit.

One of your cats is going bad too. How'd you know I was working on this Ken? LOL

 

[kbuskill]

Seems to me you have a leak in your air intake between the throttle body and air cleaner. Assuming your engine temperature was over 140 in the above readout and idling, your MAF reading is right at the upper limit.

One of your cats is going bad too. How'd you know I was working on this Ken? LOL

Just a good guess... I guess... lol

 

[swathdiver]

Just a good guess... I guess... lol

Took me a while to look up those DTCs and specs and saw you posted while I was working on it.

 

[Justin Yeager]

Thanks I'll double check things in the am and report back. Worst thing about all this is it's the wife's truck lol

 

[Justin Yeager]

Took intake tube off and inspected it very close, didn't see anything wrong. Nothing felt loose as in the silencer or whatever it is. Went ahead and replaced air filter. After I didn't notice anything wrong I took tb off to make sure new gasket looked good. Still can't find leak anywhere. Even sprayed starting fluid on entire intake tube, sprayed entire engine again while watching fuel trims and nothing changes. Ams racing suggests intake gaskets but I've taken intake off 3 times since build and they are not leaking. If I stay under 50mph and drive like a grandma the sel won't come on. As soon as I get on it a little bit for more than a few seconds light comes on

 

[Justin Yeager]

Friend had me try and unplug map sensor and start and it fires up like normal no stumble. Plug sensor back in and it stumbles on start. Almost want to give throttle while starting. Never seen any of these codes before lifter- cam failure.

 

[Justin Yeager]

No other suggestions? Really don't like anyone working on my vehicles but at this point don't think I have much a choice. I live in davison mi if anyone can help me out with a good mechanic

 

[hagar]

Those fuel trims are not showing lean, there is nothing that shows a problem with positive 4 percent fuel trims.

Was that log taken on flat ground at light throttle or going up an incline? If you were at light throttle on flat ground then there is a problem with the map sensor reporting properly. Your vac/pressure shows as just off wide open throttle in that log.

It is common to have a vac leak that shows low vac on the map reading from a vac hose or intake leak, but you would have big positive fuel trims to compensate if that were the case.

The correlation code comes from your Map reading reporting a certain kpa/psi while the Mass air flow sensor reports another, but when the computer compares the two numbers vs things like load and rpm, one or both shouldnt be reporting those numbers. It is sanity checks like that which keep cars from driving into walls if a throttle sticks for example.

 

[Justin Yeager]

Yes them screen shots were while cruising on flat ground. I did replace map sensor with delphi one but the live data didn't change. Same results with both sensors. Battery was dead today so I replaced at work on lunch and haven't driven it yet. Im a second- third shifter so I'm kinda excited to see what happens on my drive home

 

[hagar]

Its easy to chase problems and find them while creating others. Huck the old map not maf, in and duplicate the driving condtion while loggin. We breath around 14 psi, unless you are under a slight load, you should not be seeing 2 inches of vacuum or near 14 psi.

 

[Justin Yeager]

Fired the truck up after work and the oil pressure gauge pegged out! I shut the truck down as soon as I seen it maybe 5 seconds of run time. Checked oil and it looked good, maybe 200 miles on it. started back up and check engine light p0523. Sounded great so I decided to stay off the eway home, made it all the way home 36 miles no p0101 or p0106. I know all the parts have 186000 miles on them but dang another sensor lol. Gonna take the sensor off in the am and examine it. As for the p0101 and p0106 that usually only happens when traveling above 60 so wont know if them codes return till tomorrow. I will def record from torque tomorrow. Anything u would like to view to make it easier for u to diagnose? Im still learning and am very thankful for sites like this and members like u guys

 

[hagar]

Fired the truck up after work and the oil pressure gauge pegged out! I shut the truck down as soon as I seen it maybe 5 seconds of run time. Checked oil and it looked good, maybe 200 miles on it. started back up and check engine light p0523. Sounded great so I decided to stay off the eway home, made it all the way home 36 miles no p0101 or p0106. I know all the parts have 186000 miles on them but dang another sensor lol. Gonna take the sensor off in the am and examine it. As for the p0101 and p0106 that usually only happens when traveling above 60 so wont know if them codes return till tomorrow. I will def record from torque tomorrow. Anything u would like to view to make it easier for u to diagnose? Im still learning and am very thankful for sites like this and members like u guys

Yes, i would like to see the psi/kpa at idle. Do me a favor and change your scanner config over the metric so i have an easier time with it and a little more resolution to what we are looking at. Your truck is showing near 100kpa at part throttle which is the same as having the throttle wide open. I would like to see it at idle to see if it is messed up on scale or something else.
Just keep in mind that those correlation codes happen when the map is where it should be while the maf is where it should be or visa versa.
This is a very simpe problem to sort out. You have it nailed down to verifying the reason why the map isnt reporting properly.
Unless you have a 260/270 cam in that thing, it wont run at 2 degrees vacuum at cruise. And if it was a vacuum leak at the manifold you would have nasty fuel trims to show for it.
Keep the same map, log the manifold vac signal. If it is above like 30kpa at idle for a stock tahoe, then you know the signal problem is liner.