|Topic Review (Newest First)|
|10-02-2015 09:04 PM|
|15hrs to Frisco||I've skimmed through this thread and learned a lot here but I don't recall this being asked before: how is the way GM shuts down cylinders on their V8 push-rod engines different than how the MDS in the HEMI V8 works? I don't currently own a GM product with a V8 so I'm not hanging out reading boards about them much but I don't think I've heard about any problems like this with their system.|
|10-02-2015 08:39 PM|
Timing chain failure on the Dodge Challenger
No, MDS is controlled by special lifters and solenoids. It has nothing to do with the cam or VVT.
MDS existed before VVT was introduced in the Gen-III HEMI.
|10-02-2015 08:33 PM|
My theory on that has been that it isn't the mds, per se, that is the issue. It is the programming that defines the threshold for mds...that failures where imminent because the mds was allowed to operate at too high a threshold (and possibly at too low an rpm). It's like a 4-banger working too hard and lugging at too low an rpm...yielding excessive vibration and torque fluctuation, which acted like a buzz saw on the already-marginal timing chain guides. Change the programming such that the mds taps out earlier at the onset of significant engine load, I suspect the problem disappears. Mds can work troublefree, but it should be reserved for light engine load (and maybe not too low an rpm). That's when it can deliver maximum mpg, anyway.
Think about it...most cars with an i4 engine are typically not geared to run overdrive at 1500-1600 rpm. Usually it is 2200 rpm and above. Once you get below that point, the i4 is working pretty hard and lugging as far as power pulses (significant vibration and torque fluctuation). Well, that is essentially what is happening in an mds v8, when you run hard at 1500-1600 rpm (as in hwy speed operation on a slight grade or slight acceleration). It's not that the engine can't do it, as far as output. It's just that the vibration of lugging is not particularly good on certain "critical" parts in the engine. An mds v8 running at 1500-1600 rpm is comparable to a full-v8 running at 750-ish rpm...and who would think that is a particularly wise thing to do on a v8? That's my theory, at least.
|10-02-2015 08:17 PM|
|10-02-2015 12:37 AM|
|10-01-2015 05:34 AM|
DETROIT – Fiat is back in hot water with U.S. auto safety regulators.
The National Highway Traffic Safety Administration said Tuesday that the company failed to report some deaths, injuries and other information to the agency as required by law.
Following disclosure Tuesday of Chrysler's transgression, Transportation Secretary Anthony Foxx, whose department includes , told reporters he will call a meeting in Washington with all auto industry CEOs to address a long list of failures to meet reporting requirements. In the past several years, the agency has fined Chrysler, Toyota, Honda, Hyundai, General Motors, Ford and others for failing to follow the law.
"We need to have confidence the information we get is real and accurate information," Foxx said.
In a statement, NHTSA said its investigators found a discrepancy in reporting by Fiat Chrysler and notified the late July. FCA investigated and told the agency it found a lot of under-reporting.
"This represents a significant failure to meet a manufacturer's safety responsibilities," NHTSA Administrator Mark Rosekind said in a statement.
are required to report vehicle-related deaths and injuries to NHTSA so it can look for trends, spot safety problems and seek recalls if necessary. Fiat Chrysler said it would cooperate with the government and make sure the problem doesn't happen again.
A preliminary inquiry by NHTSA found that the reporting failures resulted from numerous problems with the systems for gathering and reporting data, Rosekind said. He added that the agency will take "appropriate action" after further investigation into the scope and cause of the problems.
Fiat Chrysler wouldn't say how many deaths and went unreported or when the reporting lapses happened.
"We're still trying to uncover how deep the under-reporting is and how far back it goes," Foxx said.
The announcement comes just two months after the agency slapped FCA with a record $105 million penalty for violating laws in 23 recalls covering more than 11 million vehicles.
The company also must buy back from customers more than 500,000 trucks and other vehicles in the biggest such action in U.S. history. And it had to offer owners of more than a million older Jeeps with rear-mounted gas tanks a chance to trade them in or be paid by Chrysler to have the vehicles repaired.
|09-30-2015 04:53 PM|
Are you referring to the V6 alternators?
Sent from AutoGuide.com Free App
|09-30-2015 07:52 AM|
Now FCA has a new problem to face. NTSB has open another investigation into unreported failures and deaths caused by FCA vehicles.
It seems FCA has not been truthful in it's reporting of any bad information concerning it's products. Delaying recall work is not the only issue FCA now faces.
It now seems they have vehicles issues that have caused several deaths and FCA never told anyone about it.
Perhaps too much information is updated daily due to technology and our forums. I guess it's better to be in the know, than dead, because of ones ignorance's.
|09-29-2015 11:05 PM|
So, if you think FCA is more interested in the survival of FCA Italy than FCA America then that's a bit short-sighted. FCA Italy won't survive without FCA America (Chrysler), they would be committing corporate suicide.
You don't write-off the cash cow.
|09-29-2015 10:50 PM|
|Rpaulg87||Kinda agree. This is why I am scared to go back to the Challenger. I sold my '08 SRT Challenger and got a '12 GT-500, which I love but manual is a pain in the city, though rewarding whenever there isn't a red light. But it's nice to drive something that can scare the hell out of me and won't randomly break down (like my Challenger always did). So far it has not been in the shop once, seems way more solid than my SRT was which spent one time two months in the shop. And when the rear diff went it also tore the IRS cradle bolt out, ripping the frame. I love how nice the new Challengers look inside, but it's kinda hard to keep hearing about these issues and even consider going back. I know FIAT isn't really making a profit on the cars either.|
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