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Cold start rough idle.
Bi Directional Scanner. You will be able to look at fuel trims as well as alcohol fuel % These flex fuel engines use "virtual" info calculated by the O2 sensors... and it sucks !! They get out of whack sometimes and cause all sorts of weird issues. I disable the flex fuel on the tunes I do...- Foggy
- Post #8
- Forum: Engine & Drivetrain
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Cold start rough idle.
Don't know what year you have, etc But try a fuel trim re learn/reset procedure esp if it is flex fuel and maybe try a higher grade of gasoline as well- Foggy
- Post #4
- Forum: Engine & Drivetrain
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Tail Light with Moisture
I'll remove it (again) and dry it out. Hopefully no more winter strorms I'll re seal it with the flowable silicone stuff Thanks for the suggestions -
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Tail Light with Moisture
Left Tail Light housing on my denali has moisture in it.... Both tail lights are in excellent condition so I don't want to have to buy a new aftermarket unit. Any tips or tricks to get out the moisture without ruining the housing ???? -
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2012 Suburban Misfire #5 drama
I would suspect that the wiring/ ground to that side of the coil packs harness has some issue. There seems to be no/not enough 'fire' in that hole- Foggy
- Post #2
- Forum: Engine & Drivetrain
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What are the differences between these two ACDELCO shocks?
Obviously totally different application... But it looks like Abdullah left the chat !!!!!!- Foggy
- Post #8
- Forum: Street Suspension
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Engine fan question
Stock fan settings in HP tables kick ON the low speed fans at about 216. Then High Speed ON at around 224 The problem is that they still keep the low on until it's around 196 at a small percent. so it has to drop to Zero % to turn all the way off. I have modified settings.. way better than...- Foggy
- Post #6
- Forum: Engine & Drivetrain
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Help with heater coolant line
Nice work. Thanks for the info and pics. I'll be inspecting them soon. I've replaced everything else since I bought mine in 2019- Foggy
- Post #19
- Forum: Engine & Drivetrain
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Help with heater coolant line
The heater hose that "Y's" out down by the thermostat housing has a good replacement for it as well. it has a metal Y instead of the factory plastic one... Another failure point on our "oldish" vehicles. I like gates stuff. But OE is fine and other brands too. Just use what's convenient...- Foggy
- Post #12
- Forum: Engine & Drivetrain
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Valvoline Restore & Protect experiment
Definitely need a real alcohol sensor to run E85 (which is usually e70).. These virtual fuel sensors that just use the O2's are so bad... I always reset them whenever I'm doing work as they are usually very wrong I was thinking about getting a real alch sensor on mine so I could run E every once...- Foggy
- Post #21
- Forum: Engine & Drivetrain
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2007 Tahoe LTZ 5.3 4x4 Whipple or Magnuson
SC was great for daily as I still had stock camshaft with DOD turned off... It does produce more heat - and the intercooler blocks air coming into the radiator/condensor. I upgraded my radiator to the big alum and did headers at the same time. It certainly hauled ass and low rpm power was...- Foggy
- Post #14
- Forum: Performance
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2007 Tahoe LTZ 5.3 4x4 Whipple or Magnuson
Before it was 17-18 mph hwy. 10-13 city. 10mph towing After 14-15 hwy. 10-12 city . 4.5-5.5 mph towing.. yeah that bad Took off the sc. Did a dod delete vvt cam and some cyl head massaging. About 17 ish hwy now. 10-13 city. 9-10 towing. And a lot less heat- Foggy
- Post #11
- Forum: Performance
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2007 Tahoe LTZ 5.3 4x4 Whipple or Magnuson
At that mileage I would NOT supercharge/force induction your engine. No matter how well it runs/performs now That's a lot of stress on your pistons/rings/ringlands and your connecting rods & bearings. For that kinda money you can do lots of other stuff and be happier. Plus you'll need to...- Foggy
- Post #5
- Forum: Performance
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2011 Yukon Denali 6.2 Flex issues
Post up the year, engine, transmission, etc specs on your Yukon for better help on this !- Foggy
- Post #2
- Forum: Engine & Drivetrain
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Help identifying wire disconnected by firewall, back of manifold.
The VLOM contains the deactivation solenoids for the cylinder deactivation And that's the connector for it at the rear of the intake... I would think you'd still have it connected as the diablosport just prevents it from going into the afm/dod mode. And I would think that with it...- Foggy
- Post #13
- Forum: Engine & Drivetrain
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Help identifying wire disconnected by firewall, back of manifold.
Looks like the VLOM connector Do you have your afm/dod disabled ????- Foggy
- Post #5
- Forum: Engine & Drivetrain
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Cooling fan wiring colors / advice in wiring aftermarket fans
The OE fans use just a high or low ON setting and both fans are always low/high/off together as a pair.... I thought the bcm sent a NEGATIVE signal to actuate the fans....I'm not sure though. So I'll follow along on this- Foggy
- Post #6
- Forum: Engine & Drivetrain
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Let's Talk GMT900 DriveShafts !
Thanks for the extra info swathdiver The UJoints I purchased and am going to use on my rear driveshaft are a 1350 series U Joint. IDK if the 1355 you mentioned is the same or not. I don't think I've ever used a 1355 series- Foggy
- Post #16
- Forum: Engine & Drivetrain
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Let's Talk GMT900 DriveShafts !
To update some info: I talked (finally) in person to a reputable driveshaft shop that does custom/racing/hotrod shafts. I described what I've got now and what would be needed to upgrade or prevent a future issue. My current driveshaft is approx 55" from UJoint center to UJoint Center and...- Foggy
- Post #14
- Forum: Engine & Drivetrain
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Differential Cover Fitment - 9.5 inch 14 bolt
I'm pretty sure that one won't fit. Esp with having the preload bolts. You really should not need anything extra with your 14 bolt.. It's way stronger than the AWD 10 bolt rear ends . Just change the fluid more often.. Yeah it 's messy !!!- Foggy
- Post #3
- Forum: Engine & Drivetrain
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Differential Cover Fitment - 9.5 inch 14 bolt
I purchased a similar one for my 8.6" 10 bolt rear. The company offered the standard one and a low profile one too. So I did the low pro one. It did NOT fit... But I have larger aftermarket sway bars... You might do some more searching to see if a low profile one is made. I don't remember...- Foggy
- Post #2
- Forum: Engine & Drivetrain
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Rebuilt Differential Help
Yes. Change it after the break in procedure. Some diffs like having the extra limited slip additive in addition to being a GL-5 Spec.. Make sure your valvoline is a GL-5. I have both on the shelf. Don't assume because it's synthetic that it's GL5 and has enough limited slip additive for...- Foggy
- Post #8
- Forum: Engine & Drivetrain
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Rebuilt Differential Help
Add a bottle of limited slip to it Did you break it in ??? Needs to be driven slowly in a wide figure 8 pattern several times. Then let it cool. Then take it on a 15 drive and then let it cool. Then change the gear oil in it (add limited slip additive if your synthetic gear lube doesn't...- Foggy
- Post #2
- Forum: Engine & Drivetrain
