I have been not able to drive my car for a while now because of different problems

I am running a s4 engine with s5 manifolds and a zeal megasquirt. I had my dad pull my vehicle around the block with his truck and I got it to start. I was even able to drive it down the street. but it would only be stable around 4k rpm and it wouldn't idle. when I shifted into 2nd gear it died and then started back up again.

I have the whole megasquirt datalog

I htink it might be my cas, what do you guys think?
(if you want to view the datalog you will need a program called megalogviewer)

 

belongs in the megasquirt forum, this is jibberish to me any most anyone on the second gen forum.

edit: i see you actually had a thread up over there but they locked it to keep the sub forum "clutter free"

uhhh yeah.. the purpose to have the sub forum is to get the help you need, who is telling those mods to lock threads to keep it uncluttered? wtf

 

Guess you should pm tofuball or Ken and hope for a response instead of getting your pm locked.

 

I wasn't really asking a megasquirt related question in this thread. I was asking if anyone had this problem before with a messed up cas or a unproper shielded cas. I was just using the megasquirt to rule out the useless posts of checking the ecu and whatnot.

 

If its CAS shielding, then you should be seeing spurious tachometer inputs. Was the tach jumpy or dead?

 

i am having a cas problem right now, code 3 G sensor. wont hold idle at all like yours, just stalls.

 

Why are you running a megasquirt on an N/A? Kinda weird..

 

Why not?

 

Just a question. With the Squirt do you whack out a gear on the CAS???? Seems that way on this thread: https://www.rx7club.com/forum/showthread.php?t=466051

 

I read some of your post on the Squirt forum. Imho I'd put the Squirt to the side and reinstall the stock ECU and go from there. Imho your compounding your problems with the install of the little Squirt.

After you get the engine running, then reinstall the Squirt.

I totally disagree with them shuting you off that forum, or at least that post. It does no one any good if the information you recieve is not posted online and insight. In other words others can't gain from what fixed/might fix your problem if it's kept secret and off line.

As you can see, I know not a thing about Squirts.

 

to answer your question, unless you modified the CAS then they very rarely fail. in fact i haven't seen one fail yet..

go with what Hailers suggested and put the original ECU back in and see if it starts working normally again.

the CAS only needs to be shielded from high voltage sources such as the plug wires(if the wires are not located anywhere near the CAS wiring then i doubt that is a problem) and electrical interference like aftermarket amplifiers or ignition boxes so if you don't have any of that then i would pretty much rule that out.

my answer was based off the question of your log, not many people run the MS yet so none of us have the experience or software to analyze that data.

 

Don't forget the alternator. It generates electrical fields too.

Rat

 

the tach was jumpy at first and then it would show zero while getting pulled by truck. I shut the car off and back on again while still doing 15 mph. The car managed to start but wouldn't hold idle.

But when I say the tach was jumpy I'm talking about the ms laptop tach. My stock tach was dead, it use to work before.

 

Is there a problem with me running a ms in my na, lets not get off topic okay.

 

I cant speak intelligently on the Megasquirt, but I know that the Haltech has gains and filters that are adjustable to limit the amount of spurious noise that comes down the line. If the Megasquirt has these features that I would suggest you check your settings. Too much gain and too little filter will cause all hell to break loose. You need to balance your gain (as little as possible), to your filter (as much as possible) to get a clean tach signal.

Now if your tach is just DEAD, then that (from a haltech perspective) is a definate trigger issue OR a dead coil, or a bad switching signal.

Rat

 

My cas was frozen in place and I banged it many times to get it to move and I used heat. I already have another one coming in hte mail and I am prepared to rewire it with proper wire.

I just wanted some info also

(the tach use to work with the ms before I tried timing it and that was when the banging was introduced)

 

so the megasquirt doesn't come with shielded wire for the CAS? what did you use to wire the CAS with? either find a 4 strand shielded wire set in about a 8 foot length or cut the old CAS wires out of the original harness and use those, that is fairly important.

and yeah, i forgot about the alternator, you can just pull the belt off and it won't generate any electrical noise to try more diagnosing.

i suppose hitting the CAS with a hammer could have taken out one of the sensors, i have never had to deal with breaking a CAS loose like that before, they usually move fairly freely or just need a nudge.

 

I closed his thread so tofuball and I could help him privately and more quickly than on the forum... and we don't want ZEAL support issues cluttering the megasquirt forum when there are a lot of DIYers on there, and that section is mainly for them. And tofuball has been helping him on the phone.

Looking at the datalog, it looks like your tach signal is dropping out and spiking pretty randomly.

That could be the CAS, the shielding, or really crappy grounds, or some combination of those.

 

but now the thread has moved to an unofficial forum and not exactly what i would consider the posters fault for wanting more than 2 people's input.

 

He never came to us for input before coming to the forum. So he hadn't gotten anyone's input before coming here. I don't blame him either, but the forum is really not the place for us to be helping our customers. I'll usually allow a thread from a customer to keep going as long as there is information that could help everyone else, but as soon as it gets to the point where we think the car or engine itself is the problem, we try to continue helping off the forum. It is a lot easier to help someone over the phone, where you have instant response time, than it is on a forum.

The MS we sell doesn't come with shielded wire because it comes with an adapter, which interfaces with the stock harness. We think that his CAS, or his stock harness, or something else wiring related is the problem (often cleaning up the stock ground points is enough to fix problems like this), and are proceeding from there. We try to make things easy for people, but sometimes, with 20 year old wiring harnesses and sensors, that is difficult.

In any case, I'd like to request that a mod move the thread to the MS section. I'm unable to do it myself.

Ken

 

Well, at least we were on the right track!

 

bxr I had talked to jason about the cas maybe being the problem but I just wanted some more input on a forum. I completely understand why you closed my thread on the other forum and do not object to it.

My grounds are not crappy but I am unsure of the cas wiring and I have some shielded wire ready to go.

The whole reason I wanted to ask here was to see if other people had problems with their cas, this thread has nothing to do with megasquirt but I just stated that so people won't ask about the stock ecu.

Thx for all the input guys

 

howdy all, im looking for some information on modifying a 86 t2 7 to an off road racer. first of al i cannot get her to start but it cranks, also i would like to eliminate any non critical sensors. thanksfor your time, by the by this is the first time for this place and foram. offroadbob

 

howdy all, im looking for some information on modifying a 86 t2 7 to an off road racer. first of al i cannot get her to start but it cranks, also i would like to eliminate any non critical sensors. thanksfor your time, by the by this is the first time for this place and foram. offroadbob

 

Thanks lupin.

Tofuball didn't tell me that you called him before coming to the forum. Usually if there is a problem he can't solve, he asks me, and then I call the customer up and set up a time to help.

I assumed since you went to the forum that you hadn't talked to tofuball, so I apologize for that.

I understand you wanting a "second opinion," and even understand you coming here to ask about the CAS, since they don't normally go bad unless seriously abused.

I wasn't trying to imply that anything you did to the grounds made them bad or anything either. Just that 20 year old wiring can sometimes be the cause of many gremlins.

It's good you have some new CAS wire ready to go too.

I really suspect the CAS itself since you were getting a good rpm signal on crank before you tried to move it, and then once you got it running by dragging it, the rpm signal was obviously dropping out.

Ken