| View previous topic :: View next topic |
| Author |
Message |
Tkerb92
Joined: 18 Sep 2013
Posts: 12
Location: Reading pa
|
 Posted: Mon Sep 23, 2013 8:43 pm Post subject: 1981 924 turbo hard to start |
 |
|
| I bought a 81 924 turbo a few weeks ago that has been sitting for a few years. I changed the fuel filter and the fuel that came out was all black and gooey. My issue is I can't get it started without stepping on the throttle a little. I searched for vac leaks and can't find anything. If there are any suggestions on where to look next I'd really appreciate it |
|
| Back to top |
|
 |
dpw928
Joined: 02 Nov 2002
Posts: 1860
Location: owasso, ok 74055
|
| Posted: Mon Sep 23, 2013 10:41 pm Post subject: |
|
|
Same thing happened on my 81 that had been sitting. Appears there is still crud in the fuel distributor and or injectors. I was able to clear mine out with concentrated fuel system cleaner like Techron or Gumout. Took 2 tanks of fuel to get it really running right.
Dennis
_________________
81 931 5 sp
78 928 5 sp Silver
78 928 AT Euro Black |
|
| Back to top |
|
|
Tkerb92
Joined: 18 Sep 2013
Posts: 12
Location: Reading pa
|
| Posted: Tue Sep 24, 2013 1:29 am Post subject: |
|
|
| dpw928 wrote: | Same thing happened on my 81 that had been sitting. Appears there is still crud in the fuel distributor and or injectors. I was able to clear mine out with concentrated fuel system cleaner like Techron or Gumout. Took 2 tanks of fuel to get it really running right.
Dennis |
Thanks, hopefully something simple like that will work. I'll probably pulley the distributer and injectors out and just soak them in fuel system cleaner first |
|
| Back to top |
|
|
Rasta Monsta
Joined: 12 Jul 2006
Posts: 11733
Location: PacNW
|
| Posted: Tue Sep 24, 2013 8:05 am Post subject: |
|
|
1. Smoke intake
2. Repair all vacuum leaks
3. Check system and control pressures, hot and cold
4. If needed, correct system pressure via shim adjustment to primary relief valve, correct control pressure via WUR refresh
5. Set mixture
If cold start persists following above steps, report back.
_________________
Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
|
|
| Back to top |
|
|
Tkerb92
Joined: 18 Sep 2013
Posts: 12
Location: Reading pa
|
| Posted: Wed Sep 25, 2013 8:43 pm Post subject: |
|
|
| I'm pretty sure I've got it narrowed down to the cold start injector. I hooked direct power to it and it started up perfect. So I'm guessing the temp sensor is bad. If anyone knows where that is located or any details about it I'd appreciates one info |
|
| Back to top |
|
|
staticsan
Joined: 19 Jan 2009
Posts: 450
Location: Sydney, Australia
|
| Posted: Fri Sep 27, 2013 12:38 pm Post subject: |
|
|
| Tkerb92 wrote: | | I'm pretty sure I've got it narrowed down to the cold start injector. I hooked direct power to it and it started up perfect. So I'm guessing the temp sensor is bad. If anyone knows where that is located or any details about it I'd appreciates one info |
From memory, it is either in the coolant line behind the engine where the dash's temp sensor is, or in the line that comes across under the intake manifold. In other words, difficult to get to. :-/
The Haynes book (which I don't have here at work, obviously) is fairly clear.
Wade.
_________________
'82 British NA - Which I think I've been very lucky with! |
|
| Back to top |
|
|
Tkerb92
Joined: 18 Sep 2013
Posts: 12
Location: Reading pa
|
| Posted: Sun Sep 29, 2013 1:34 am Post subject: |
|
|
| staticsan wrote: | | Tkerb92 wrote: | | I'm pretty sure I've got it narrowed down to the cold start injector. I hooked direct power to it and it started up perfect. So I'm guessing the temp sensor is bad. If anyone knows where that is located or any details about it I'd appreciates one info |
From memory, it is either in the coolant line behind the engine where the dash's temp sensor is, or in the line that comes across under the intake manifold. In other words, difficult to get to. :-/
The Haynes book (which I don't have here at work, obviously) is fairly clear.
Wade. |
Yeah I found it under the mani, and good way to go about testing it to see if it works or not? I'm pretty sure it doesn't but I want to be sure before I buy a new one |
|
| Back to top |
|
|
dpw928
Joined: 02 Nov 2002
Posts: 1860
Location: owasso, ok 74055
|
| Posted: Sun Sep 29, 2013 2:07 am Post subject: |
|
|
You can ohm test the thermotime switch. If it is cold, there should be a low resistance circuit between the two connections and if warm there is still a high resistance circuit but not enough amps to engage the CSV. Also, if you have a circuit from the positive post to the body of the switch, it is bad. Not sure why they keep a high resistance circuit all the time. May be to keep the heater warm.
Dennis
_________________
81 931 5 sp
78 928 5 sp Silver
78 928 AT Euro Black |
|
| Back to top |
|
|
Tkerb92
Joined: 18 Sep 2013
Posts: 12
Location: Reading pa
|
| Posted: Tue Oct 01, 2013 12:23 am Post subject: |
|
|
| I've got it running pretty healthy now. Cleaned up some grounds that were corroded and fixed a few vaccume lines but the only problem not is when it's ideling if I just slightly touch the throttle it sputters and wants to die. If I give it a hard rev it's fine but a real easy press on the gass basically kills it |
|
| Back to top |
|
|
dpw928
Joined: 02 Nov 2002
Posts: 1860
Location: owasso, ok 74055
|
| Posted: Tue Oct 01, 2013 12:43 am Post subject: |
|
|
If your distributor has 2 vacuum lines going to the advance, you may want to recheck the routing to make sure the lines aren't reversed.
Dennis
_________________
81 931 5 sp
78 928 5 sp Silver
78 928 AT Euro Black |
|
| Back to top |
|
|
Tkerb92
Joined: 18 Sep 2013
Posts: 12
Location: Reading pa
|
| Posted: Tue Oct 01, 2013 4:40 am Post subject: |
|
|
| dpw928 wrote: | If your distributor has 2 vacuum lines going to the advance, you may want to recheck the routing to make sure the lines aren't reversed.
Dennis |
I'm not positive but I think it doesn't have any vac line one it |
|
| Back to top |
|
|
dpw928
Joined: 02 Nov 2002
Posts: 1860
Location: owasso, ok 74055
|
| Posted: Tue Oct 01, 2013 5:29 am Post subject: |
|
|
Think you are right. Forgot that you had an 81 931.
Dennis
_________________
81 931 5 sp
78 928 5 sp Silver
78 928 AT Euro Black |
|
| Back to top |
|
|
dpw928
Joined: 02 Nov 2002
Posts: 1860
Location: owasso, ok 74055
|
| Posted: Tue Oct 01, 2013 5:34 am Post subject: |
|
|
Have you checked the vacuum line going to the computer under the center console?
Dennis
_________________
81 931 5 sp
78 928 5 sp Silver
78 928 AT Euro Black |
|
| Back to top |
|
|
Tkerb92
Joined: 18 Sep 2013
Posts: 12
Location: Reading pa
|
| Posted: Tue Oct 01, 2013 9:57 am Post subject: |
|
|
| dpw928 wrote: | Have you checked the vacuum line going to the computer under the center console?
Dennis |
Alright now I know you're just #### with me because I thought your were talking about the fuel distributer first but now you're saying the computer. I know doesn't have vac lines |
|
| Back to top |
|
|
dpw928
Joined: 02 Nov 2002
Posts: 1860
Location: owasso, ok 74055
|
| Posted: Tue Oct 01, 2013 10:40 am Post subject: |
|
|
There is a vacuum line going to the computer. While there you may want to check for corrosion on the electrical connections.
Dennis
_________________
81 931 5 sp
78 928 5 sp Silver
78 928 AT Euro Black |
|
| Back to top |
|
|
|
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
924 FAQ (Technical)
