Dragons91RS

ok my car is tbi so i figured this could go here

my ses light is getting turned on by code 22 for the tps. wierd thing is I only get it when driving, never at idle and it is an off and on thing the ses light wont just come on and stay on.
I rebuilt my TB about a week ago and the ses light came on with code 22 so I adjusted the tps and the light went off so I assumed it was adjusted right, what could my problem be?
also I get a bouncy tach at cruising speeds which I was thinking may be a bad ignition module or other dis part so I am saving the money now to get a new dis, but could the bouncy tach be because of the tps? only wierd thing about that idea is the ses light getting set because of the tps is and off and on thing wile driving and the bouncy tach is consant . what do you all think?

any info is appreciated :hail:

Frik92RS

OK let me try this one out.

First the TPS problem, did you change out the TPS when you rebuilt the TBI unit? If you did then the new one might be bad. If you didn't check to make sure that the wires didnt get damaged inside the connector when you unplugged it, if you hadn't unplugged it before the brittle wires could have frayed.

Second the tach bounce, conventional wisdom says its a loose tach wire but we have electronic tachs to prevent that. It's most likely an issuse with a loose wire somewhere and the tach isn't getting sufficient voltage to operate smoothly. There might also be a bad connection somewhere in the distributor area that is causing a false reading/low voltage.

Hope that helps!

Dragons91RS

its still the same tps that was on it when I got the car. Ive had the wires off several times. mostly b4 the rebuild. thats whats confusing me about it. I never got code 22 b4.

and with the tach bounce I can feel it in the engine so Im guessing it isnt a loose wire.

Frik92RS

ah new information I see, you didn't say that the actual rpms were changing. Then its most likely a vaccum leak from the seal around where the TBI meets the manifold, assuming that you took it off to rebuild, also check the integrity of the vaccum system in general, you'll find leaks where you never expected them to be.

The TPS has me baffled, maybe the one you have got damaged somehow and you need a new one.

Dragons91RS

I did remove the TBI unit to rebuild it, but I used a new gasket when I reinstalled it. I did break the vac line that went between the TBI unit and the map sensor, but I immedatly went to autozone and replaced it and it hasnt set a code for it since.
Other than that I dont know of any other vac lines I broke, and they were all fine b4

Frik92RS

It's very possible that simply unplugging and putting them back could have caused sealing problems at the ends, vaccum line is cheap enough that I'd say replace it, it took me about an hour to do all of it on my car, and see what it gets you. At the very least you'll have piece of mind that it either was, or definetly is not the cause of the problem.

1MEAN92RS

I don't think you could go wrong with replacing the TPS either. It'll put you out ~$10, and if the old one is OEM, you can bet it prolly wasn't working at 100% anyhow.

Later,
Harry

Dewey316

you should get a DVOM and check the voltage of the TPS.

closed it should be about .54v, WOT, it should be 4v or so IIRC. if you voltage is off of those marks then get a new TPS.

Dragons91RS

Ok, I need to come up with a volt metter and check the tps.
using my head this morning(even with a hangover) I realised the tach bounce and tps can not be connected to each other. The tach bounce started befor I rebuilt the tbi, and befor the rebuild I never got a code 22.
There was alot of crap built up on my tb befor the rebuild, I wonder even thoe I was carefull when removing the tps if maybe it ended up damaged because of all the crud that was on it

Frik92RS

I'm putting my money on a bad TPS. Its so cheap and easy to replace, I say go for it! After you get that working we can tackle the loping idle. Just a quik question about that, if you hold you foot on the pedal and keep the rpms at 1500, 2000, 2500, 3000 and so on does it still lope?

Dragons91RS

when the car is cold the tach will not bounce at idle, only at cruising speeds ie 50+mph @ 2500+ rpm's, but it is starting to get worse. now after the car has been driven a little bit and the engine has had plenty of time to warm up the tach will bounce at idle also. another wierd thing about it, if I start the car wile cold and just let it sit and run in my drive way even once its up to temp the tach wont bounce(yet) its like some thing needs to get hot and get working at higher rpm's than idle for it to happen.
In another post about that I made someone said they had the same problem, and it got worse like mine seems to be doing, and the problem went away when they replaced the distributer. Im thinking maybe the ignition module. Im gona take it out and go to O'reilly to have it tested, if it comes out bad Im gona replace it with a Holley Annialator ignition module and get a MSD 6al ignition box. if its some thing more to do with the dis than the ignition module Im gona replace the dis its self with a MSD.
as I cant seem to find a vac leak and all other ignition parts are new Im guessing it has to have some thing to do with the dis.
If thats not it, then Im at a total loss.

Dragons91RS

ok Ive came to the conclusion(99.9% sure) that my tach bounce has to be because of the ignition module. it seems the previous owner had recently replaced it prior to my purchase, and DID NOT put the grease on the metal plate on the bottom of it so it seems what has happened is that three months of my driving the car plus how ever long he drove it this way has caused the ignition module to fail when it gets hot(as per my haynes manual:if the ignition module is not properly greased when installed it will quickly fail)
so it looks as thoe in about 2 1/2 weeks I'll be orderig the Holley ignition module and the MSD ignition box that Im at least happy about, because with out this problem I wouldnt be getting those parts. :lala:

Now if I get the tps fixed I should be all set!

Thanx for the help you all, :hail: Im guessing the tps got damaged some how when I rebuilt the tb based on your alls info, so Im just gona replace it when I fix the other prob.


BTW anyone know if MSD makes an ignition module for our dis?
Id like to have it all MSD if at all possable.

1MEAN92RS

I think Summit p/n MSD-8364 will work depending on what dissy you have now. Ask them to make sure. If not, I'm certain Summit would have something else made by MSD that would work.

Dragons91RS

Summit is where Im gona order my stuff from. sadly that one wont work, Ive looked in there on-line catalogue and the March-April regular catalogue neather had an msd part that would work it needs to be like this one this also happens to be the one Im going to order.

Thanx for trying thoe