I'll have to apologize if you are feeling picked on, but I can pull out definite reasons why your posts are getting downvoted. Let me point a few of them out.
First, there's this answer about a power loss problem on a Opel Meriva with CDTI engine. The answer (at this point) has two downvotes on it, with no upvotes. I'd like to point out, two downvotes equate to two different people downvoting your answer. It is doubtful there's a conspiracy on this answer to have two people downvote you. As far as the answer itself, you give an answer which might be of use to a car with a regular gas engine, but within the body of the question, it states it's a CDTI engine, which is clearly diesel operated to anyone who has been around the subject for any length of time. When this was pointed out in the comments, you basically acknowledge you didn't know this (ie: "ah well in that case"). If you didn't know enough to answer the question correctly or with some sort of knowledge, I'm not sure why you were answering it at all. I'm sure this is why, on this answer, you garnered the downvotes. There are several comments on the answer. While none of them specify they downvoted you, it could definitely be interpreted that way they might have.
In this answer about v6 Mustang wear and tear, you basically just throw an answer out there which really doesn't give an answer. It tells the OP what they might want to do, but really doesn't explain why it might be the correct answer. Then you state in the comments to just throw it out as an answer and put something else in its place. This, too, is a regular faux pas around here.
In either this or the other case, people who have been around for a while who might make these types of "mistakes" would either edit their answer to better conform with the question or delete their answer altogether.
You state you've been around as a mod on other sites. While this may be true, you still do not seem very knowledgeable about how Stack Exchange works. You say:
... this community it seems this place may have thrived years ago but it may have turned into a haunt that caters to the few rather than the many.
I would contend you couldn't be more wrong. While we may not get a huge amount of questions here on MVM&R (I think we were getting ~15/day last time I looked), all you need to do is look at Stack Overflow's question count of nearly 7k questions per day, 10 million visits, and 9.6 million users to know it's far from a haunt.
I propose to you, if you'd take the time to review the Help Center topics a little bit, then spend some time rummaging around the older, more popular questions, you'll get a feel for what gets upvoted as a good answer. Then take a look at some on the other end of the scale to see what gets downvoted. I'm sure it will become plainly clear before long what you might need to do to get better recognition with more reputation and respect for your answers.
Please don't take this as me trying to insult you or be passive aggressive. You asked the question, so I'm trying to answer as honestly as possible with you. Take your time and read the questions before you answer. When you do answer, try to ensure you are directly answering the question with purposeful content and forethought as to what you're trying to say. If you don't know what's going on in a question, ask qualifying questions in the comments. When all is said and done, you'll do just fine.