Project Cars or Member’s Cars sub forum for the build threads so readers can follow the creation or re-creation of a high performance Caddy. Whether it is a CTS-V, a 1970 Eldorado, a Northstar powered Eldo, etc. , an organized way of finding and enjoying and learning from others who have the need to modify their rides for performance or racing.
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Är det någon där? Forumet verkar inte så livligt?
Men i alla fall; som sagt, tomgången med varm motor rusar under inbromsning eller gassläpp i låg fart till mellan 1200 och 200 varv typ. Till slut blir ISCn så förvirrad att den stänger av helt, tjuvstopp. Jävligt pinsamt. Bytt ISCn till ny med ingen skillnad. Inga felkoder. Problemet dök upp nu efter vintervila i varmgarage 20 grader. Bytte ISCn som sagt till flång ny men det hjälpte naturligtvis inte. Den gamla ser dessutom fin ut inuti..... Haft bilen i 10 år, inga liknande symptom innan.Förvaring alltid torrt och fint, så inga fukt- eller kondensproblem. För övrigt går bilen perfekt. Inga misständningar eller annat konstigt, pigg och mjuk gång. Eldorado 1992 4.9, 23000 mil och superfin för övrigt. På riktigt. USA spec med röda bakljus etc.
Så - ???
Perhaps at highway speed both multi-displacement engines are operating on two cylinders, the 5.3L on two 0.6625L cylinders, the 2.7L on two 0.675L cylinders, and so are pretty similar in fuel consumption.
I'm guessing hwy mileage suffers in the Silverado because of the lack of aerodynamics as speed increases. Turbos can be efficient but only when they aren't called on (too much) for that extra needed power (kind of like a four barrel carburetor of old; efficient when power isn't needed but the extra power is available when the back two barrels kick in; my analogy to the turbo is the boost not used unless needed). At hwy speeds, I'm guessing that the 2.7 turbo is relying on boost to run at speed. The CT4 cuts a much better air path so it works much better at hwy. Well, that's my take on those numbers anyway.
I added this comment to the video: For 2020 Chevrolet shows the 5.3L/8speed/2WD at 17/23 mpg (vs 5.3L/10speed/4wd 16/22), and the 2.7L T/8spd/2WD at 20/23 mpg. So the 2.7L is 17% better in city, same highway in the same configuration. An interesting factor on the 2.7L is the low-rpm torque, and what potential it has for tuning.
I don't have comparative hp/torque charts for each of those engines, but I suspect the 2.7L drives better
5.3L: hp 355 / 265 @ 5600 (SAE certified) Torque 383 / 519 @ 4100 (SAE certified)
2.7L: hp 310 / 231 @ 5600 (SAE certified) torque 348 / 473 @ 1500-4000 (SAE certified)
So the 5.3L makes more peak power, but the 2.7L probably feels more 'torquey' off the line.
On the other hand, if they had put the 5.3L in the CT4-V people would be singing praises as a small sedan with a V8.
Good morning Mike. I've been searching in the forum about rich cold start. I have a 1993 Cadillac deville 4.9 v8. I've done maintenance. full tune up. Plugs, wires, cap and rotor. New EGR, and new PCV valve. Throttle body cleaned and air intakes (those were bad) checked the timing yesterday (at 24 degrees) don't know why but I'll bring it down. Cold start rough... too much fuel. Runs perfect after warm. Any suggestions about the rich cold start? Any info it would be much appreciated. thank you.
I live in Terre Haute, IN. Do you know much about 4.5 Liter engine? I have a 1988 Fleetwood (FWD)... I am needing to find someone to do some work on it.
firstname.lastname@example.org Let me know if you can help.
New Guy here.I owned a 96 Eldorado years ago and loved it.It was stolen.I bought an 03 Mercury Marauder brand new.I drove it for 13 years.I did a lot of modifications to that car,very fast..In 2016 I bought a new Challenger,V6 305HP.I never really adapted to the car and wanted that Caddy ride....I just bought an 02 Eldorado.Love it..It needs some love..I'll be asking questions for sure.Thanks for having me.