924Board.org

[B]

hey everyone,

this may seem like a stupid question, but... I started the car the other day and it started fine(turned the key no clutch or gas pedal assistance), however when I pressed on the gas there was a slight hesitation and some sputtering. I waited a second or 2 and did the same thing. the third time started in a similar way but it seemed the longer I held the pedal down it seemed to work through the hesitation and the motor accelerated fine.
After about 10-30 seconds (it seemed), the motor seemed to accelerate ok.

I checked the first plug and it was rather black and smelled of gas. I also checked the timing marks and they seemed fine.

does the plug coloration and smell sound (combined with the symptoms) sound like it might be running rich - ? something else?

any help would be greatly appreciated

thanks

Sean
_________________
1979 924 n/a
BAE turbo
5-speed snailshell

[ideola]

High likelihood of a leaking injector or cold start valve. Or a malfunctioning WUR.
_________________
erstwhile owner of just about every 924 variant ever made

[B]

thanks - I kind of thought it might be a fuel issue -

fuel pressure test for the wur - correct?

for the injectors, is that a pull out and see?

csv - pull, block the hole, start and see if it shuts off -?

if the csv is faulty , is there a fix for that or will it have to be replaced?

thanks very much, again

Sean
_________________
1979 924 n/a
BAE turbo
5-speed snailshell

[ideola]

[B]

update -

the csv sprayed very nice for a brief time (few seconds) then shut off with no drips for over a minute

I checked the injectors - that is a different story. each injector had a poor spray pattern - (if anyone has the Pobst book, Ch 6, page 15 bottom spray image fig 4- unacceptable spray patterns. each would spray better when I revved the motor with the throttle cable, then went back to pathetic.

Is there a way to clean these without having to send them out to someone - I realize that would be best and I will ultimately do that but as a "for now" fix"?

could this injector problem then be the acceleration problem?

thanks very much
Sean
_________________
1979 924 n/a
BAE turbo
5-speed snailshell

[B]

oops, sorry Charles Probst Bosch injection book
_________________
1979 924 n/a
BAE turbo
5-speed snailshell

[ideola]

You can attempt to do it yourself, but I've never read any encouraging anecdotes. If I were to attempt it myself, I would purchase one of those inexpensive home workshop ultrasonic cleaners.

Unfortunately, these injectors cannot be disassembled (to my knowledge), and one of the big issues with them is that the springs wear out and lose their ability to maintain proper flow. One of the benefits of sending them out is that Mr. Faircloth will check the flow rates so you know exactly what you're dealing with. For $18 per injector, it's hard to complain, and his turn around time is very quick. Or you can buy new ones. I sell new NA injectors for $176 per set of 4.

Yes, the injectors could absolutely be impacting your acceleration if they are not flowing properly or enough.
_________________
erstwhile owner of just about every 924 variant ever made