HOW TO: JUNKYARD M90 BLOWER ON A 5.3L Z71 SILVERADO-WHAT WENT WRONG? WHY DOESN'T IT MAKE POWER? 

None of the Gen 3/4 coils ground through the mounting bolts. The coil brackets and valve covers are insulated from ground.....

Every coil that I found bad = we're physically broken or aftermarket.

the gen 5 I just bought weighed like 30 lbs.

@lifeishard1211 Yep, I have a gen 3 and 5. Not bad until you are bent over front and trying to set them in place. Not bad if you can get in engine bay but mine I couldn't

Maybe your catalytic converter is stopped up and it just won’t flow anymore so the added boost is killed by extra exhaust back pressure and the power to turn the blower?

Champion made a plug cleaning / testing machine back in the 1960's or earlier. There was a spot to screw the plug into then you applied air pressure to see if the plug still sparked when you looked through the little glass window.

agreed

​@richardholdener1727 hey Richard first let me.say I love your channel... I have learned so much ... now for my real question can you please tell me what head gaskets I should run on my all stock lm7 Gen 3 5.3 I'm putting twin turbos on it I'm honestly not gonna run more 8 to 10 pounds of boost its just a Lil weekend truck not racing it at all more of just a truck meet thing it has 862 heads with a mild cam and push rods

I don't ever see any tall decks in junkyard-but the same things work on a tall deck.

already made 600+ hp-so there is plenty of flow

I just said the same thing, you beat me to it.

different injectors

compression test was done

we dropped the exhaust

we use calibrated MAF and proper sized injectors back in the day, but actual tune is better

maybe demeuse engineering will make a few more adapter plates.

they are available

you would have to welcome me 35 years ago

I was a GM tech since 1989. Doing the trouble shooting is the worst.

@@richardholdener1727😂

the blower works with stock exhaust-we also tested dropping the truck exhaust while on the chassis dyno

Leakdown test would be my next step before spending any money. If that checks out then coil.

@@thatturbotruck He said they did a compression test and that looked fine, so why would you go on to do a leakdown test in addition to that? Not asking sarcastically, I'm genuinely curious. If you do a power balance test and identify an issue with one cylinder, and then a compression test and that cylinder shows the same compression as the rest, I would move compression to the back of the line as likely culprits and go on to look at fuel and spark. I know a leakdown test can give you more specific information if there IS a problem related to compression, but I can't think of a scenario where it would identify a problem exists (that has been narrowed down to a single cylinder) that a compression test would miss.

@@nowayjose596 what you are saying is in general correct. But I've seen these motors have a slightly leaky valve and produce decent compression test results and test bad on a leak down. This is because a small leak may only be down 8-10psi vs the other cylinders which is acceptable yet when it's running and making 1000+psi when compression occurs that small leak becomes much bigger. It's not a guarantee or anything but a test you can run before spending any money is all. I would typically go for compression test first myself.

@@thatturbotruckThanks for the reply. I agree, if he had a leakdown tester available then while he had the valve cover off would have been an easy time to test that cylinder just to verify.

we did a compression test

it goes to the MAP-no boost leak

love to-they are expensive and I don't find them in yards

the factory MAF on the truck is in its factory location

you need to watch the video where we ran 8 oxygen sensors on this M90 set up

not fuel pressure

@@richardholdener1727 it's gotta be fuel something then.

no leaks-boost was there

no need for intercooler at this low boost with the correct timing

it was-but only at idle

no boost leak

we dropped the exhaust

REMOTE TURBO WORKS OR A SUPERCHARGER INSTEAD

Do you think that the Vortec 4200 Turbo for space in the engine compartment can be good compared Ls supercharge or turbo?Or it's not worth it.@@richardholdener1727

the older chip ECUs could be programmed with timing and fuel changes via changing the chip

I only see retrofits from Comp that are big enough-maybe another cam manufacturer

no boost leaks-boost was solid

I dont believe the issue is with the motor

I think it has to do with the injector plug, coil pack or a combination of both on that particular cylinder. I don’t think it’s a spark plug because you said that you swapped them around, correct? If it were a spark plug and you did move them around then it would’ve followed the plug. The only thing you messed with was the injector plugs and it’s possible that you could’ve had a weak coil when it was N/A and ran fine until boost was applied. 2 months later and have you pinpointed the issue?

we didn't run a flex fuel sensor

we dropped the exhaust

In live stream he said he removed the cats for a test and only marginal power increase onserved

no-the blower made over 500 flywheel hp

I had a spark plug that the insulator cracked. Sounds obvious to find except it was on the combustion side so when installed in the engine, the insulator slid down against the ground strap blocking the spark. ( think about how you would look to see if a plug was firing out of the engine. . . _)

@@bobroberts2371 Find somewhere really dark and start the motor and look for arch’s. Guarantee you would’ve seen the spark even if it was blocked and you couldn’t see it during the day.

@@jongoin4404 So you are able to see inside the engine while it is running? The insulator was cracked on the combustion side of the spark plug and would slide up and down on the center electrode. Hold the plug threaded side up and the insulator would slide making the plug look normal. Hold the plug threads down and the insulator would slide down covering the gap and spark.

& Increase fuel injection rate.

Replace the ecu for 7psi? 😂

that doesn't happen

The lm7 in my turbo s10 had 267k. Went to check ring gap and they were .025-.026 on top and .027 to .028 on the bottom. Slapped em back in and kept the file fit rings for my lh6 lol

@@sons_of_slewfoot_garage back in the '80s when I did small block overalls used to see excessive ring gap but that was mainly due to cylinder wear I seen up to 0.40 ring gap and seen it worse than that but I said it was due to excessive cylinder wear to where the block had to be 40 to 60 over to clean up because it would have a groove off to one side at the top of the bore. I'm going to be honest I've been out of the game for a long while. Just got back in and everything I seen in pictures and video on the new LS and LT motors. They don't have that issue anymore like the sbc. Thank God. The L59 5.3 with 159,000 on it I picked up when I did the tear down the ring gap was top ring was 0.29 second ring was 0.32 and that was pretty much the same across all the cylinders. That was quite a ring gap for a stock motor with that many miles. The rod and main bearings were perfect! So upgraded to Gen 4 rods and upgraded to summit racing forged pistons raising my CP to 10.6 with 243 heads with a new Z06 camshaft and new cam bearings because I looked at them when everybody said don't.

@@richardholdener1727 Rich, I based what I said on when I used to work on SBC back in the '80s. Most of what I saw had excessive cylinder wear causing a large ring gap and the cylinders were kind of oval shaped where they had to be bored to 40 to 60 over to clear it up by then the engine at 60 over pretty much junk for a daily driver. But from what I've seen of the newer engines in pictures and videos like you put out in your videos the engines don't have that excessive wear like the sbc did back in the day. I stopped doing engine work in 1987 it went full-time in the car, audio and security business. That's where the money was at that time everybody had to have the boom in their ride. And nobody was going fast with a 1000 to 1500 lb of car audio in their car or truck. LOL The only drag racing I was doing was drag racing but those days are over. My hearing is screwed so it was time for a change of pace.

Ish was in the driver seat doing the tuning 100% that’s correctly done

Plus a bad transmission isn’t going to make one cylinder “dead”. I think it has to do with the injector plugs, coil pack or a combination of both. I don’t think it’s a spark plug because they swapped them around. If it were a spark plug then it would’ve followed the plug. The only thing they messed with was the injector plugs and could’ve had a weak coil when it was N/A and ran fine until boost was applied.

did you see the part where I said it made 7 psi, boost was there