New to the Forum - 73 1.7L FI, questions about running rough Options

[tadink]

Hey all - Please allow me to introduce myself and I'll post some pix as soon as I can. I'm a longtime PCA member and have restored a 67 911 that is still in the family....now I've gone an purchased a 73 914 1.7L Fuel Injected car in the Bay Area. It has been sitting for a bit, does not have appreciable rust, and seems in generally good shape apart from some mostly minor issues.

Question - after having been sitting for 6+ months, she fired up and ran - but a bit rough. No engine noise or knocks, but the idle is rough, it stalls at low rpms, and is pretty rough except under a good amount of throttle. I'm thinking dirty injectors at least - what is the best course of action from here?

options - add injector cleaner, good gas, run the bee-jesus out of her
option2 - get the thing to the mechanic and let him sort it out
option3 - ????

your help and guidance is appreciated - I've had great success with the lads on the Pelican Parts 911 board, and you all seem quite helpful as well as I've read thru the posts on this board. Hope to be able to contribute as well as learn...

best

tom

[tadink]

LOL - - you guys are the best, and I'd take your advice if I knew what the heck you were talking about - - - MPS, TPS, huh?

I need an idiot's guide to fuel injection, clearly! Is there such a resource anywhere on the site? something that takes total newbies like me thru the basics of what the heck I'm dealing with?

Pix in the morning - got the driver's window replaced (broken out by hoodlums) and put on the inner door skins, inside door handles, and started taking some inventory of what this 'near barn find' has to offer. The vandals took most of the screws out of anything that had a screw in it - - - what is the value of a screw???? - - - - and so there is a bunch of stuff rattling around loose! They also cut out the headlamp motors, so I have that to deal with yet. AND they took all the fuses! really, the fuses???? good grief....LOL

but, all in all, minimal rust that I could find. Tomorrow I dig into the engine bay - and I'll look around for an MPS or a TPS -

thanks for all your help - - -

td

[swl]

I need an idiot's guide to fuel injection, clearly! Is there such a resource anywhere on the site? something that takes total newbies like me thru the basics of what the heck I'm dealing with?

That would be Brad's site. It looks a bit overwhelming but if you take an hour and go through it at you'll have a good grasp of the parts involved and understand the secret language (IMG:style_emoticons/default/smile.gif) http://members.rennlist.com/pbanders/djetparts.htm

The MPS is the manifold pressure sensor. often described as looking like a hand grenade. to the rear of the battery mounted to the inner fender well. It controls the enrichment process when you open up the throttle. The correct answer to the question of holding a vacuum is to buy or rent a vacuum puller (small pump with a guage on it). Bring the vacuum up to the specided test value (see Brad's site). And watch to see if it holds that vacuum. The quick and dirty first check is to just suck on the port and use your tongue to seal off the port. You will look real silly but if the diaphram is leaking badly you should know right away. If it seems to hold you should probably do it again with the vacuum puller to ensure there aren't slow leaks.