freda 2.5td slow start from cold problems

[haydn callow]

Behind the glovebox??

[Snail921]

Ah, that's certainly one place I haven't looked. I'll let you know
Regards,
Brian.

[Snail921]

and there it is, many thanks, Haydn. All I need to do now is work out which pin does what.
Regards,
Brian.

[haydn callow]

Do a forum search....I'm sure there is a diagram somewhere.

[Northern Bongolow]

they switch on/off/on/off until a certain temp is reached.

from cold i have power to the glowplug busbar from switch on for 12 seconds. After that there is no further power to the busbar throughout the warm up to working temp and well beyond.
The book says "The long-afterglow feature activates the glow plugs for approximately 10 minutes after engine start when the engine is cold." Failure to do so, it suggests, means a fault in the PCM.
Brian.

the above only applies if the throttle is set correctly. if you rev the engine, or the cable isnt set up correctly it will turn off the glow plugs as it is thought you dont need them, then back on tick over they come back on. play about with the throttle cable set up up. the turn off threshold is about 850 - 900 revs if i remember right and your cable is set right. (take into account the plunger at the end of the throttle cable adjuster, this turns off the plugs.)
the revs during the cold start process should be held at around 750-800 revs with the 2 stage pickup action of the 2 solenoids, when they both turn off (about 50 deg c coolant temp) it should be warm enough to hold its own without the need for glow plugs or cold start solenoids (revs pick up.)

[g8dhe]

Diagram starts on this page;

but check your year.

[Rifster]

Thanks guys for all your help.
Rifster

[Dogran]

I was told by the person who sold me my bongo to ignore the glow plug light on the dash, but wait until you hear the relay click before attempting to start the engine. This has always worked for me over the subsequent 4+ years....

[Rifster]

I have now changed the glow plugs and tested the relay to make sure it clicks on and off and that the power is getting to the glow plug strip. whilst stripping the components above the glow plugs, which are 2 switches with small pipes leading to them, 1 small pipe broke, 1 is not looking good, and 2 were glued on the tops of the switches which have now broken. after the glow plug change the motor started ok but it had been used prior around 2 hrs before. NOW that the motor has been sitting for 2 days without use I tried to start it and I am getting no spark at all it just keeps turn over. before the plug change it would start after a few tries BUT now its doing nothing just turning over...... can anyone help. what are the 2 switches above the glow plugs and how important are they ???
Thanks in advance for any help.
Rif

[Snail921]

they are the cold start solenoids, See http://lushprojects.com/bongopartsmk2/c ... 1of02.html They are Y and Z on the schematic.
As you look at them, number 1 is on the left and number 1 on the right. When starting from cold both should be open giving vacuum to the fast idle control device. At around 10 C number one should close and number two at around 60 C. This, according to the book, should give you an idle of 1750 +/- 10% from cold, 1150 +/- 10% at 10C and then 750 at 60C
These are controlled by the PCM which, in turn, takes its cue from the temp sender.
Regards,
Brian.

[Rifster]

Thanks Brian.
So if there is any breaks in the pipes or on the senders themselves this will not let the motor start from cold am I right ? could this also be the reason why it was starting to take longer to get the motor started before as there may have been a leak before.?? so putting in new glow plugs will not make any diff if these 2 units are broken?? if however the motor had been running previous then it will carry on starting until left over night, then the cold start soleniods will not work if broken, this is my understanding. Thanks for all yr help. Please let me know if I am on the right track with this problem.
regds
Rif

[Simon Jones]

Not quite. The cold start solenoid is primarily there to press the throttle to increase the revs as it warms up. You can do the same thing with your right foot, but only once the engine is running.

Cold start solenoid failure/breakage should not affect the glow plug operation. Have you tried measuring the voltage across the plugs when you turn the ignition on and try to start it? There should be at least 9v which will continue for a minute or two after the glow plug light goes out.

Short term, block any rubber pipes that are now disconnected as it is allowing air into the vacuum system which may reduce the affect of the brake servo.

Another cause of poor starting is leaky seals on the injector pump that draw in air or allow diesel to escape. Check for signs of fuel around the pump.

[Northern Bongolow]

the cold start solenoids keep the revs at or below a steady 900-950 revs when set up correctly during start up. IF THE REVS GO ABOVE THIS IT TURNS OFF THE GLOW PLUGS, so doing it (by foot pedal) is quite hard but possible.
try starting on a light foot. you can test this with a volt meter at the glow plug rail.

[Rifster]

hi guys,
Can anyone recommend a bongo specialist around the Heathrow area that can take a look and do the repair work for me as its getting too much. A small pipe from the fuel pump to the rail has now broke and so have some pipes to the soleniods, they have all gone hard and snapped. I need someone to strip and replace all the pipes and I have a small leak somewhere thats needs looking at. Thanks for any help. Rif

[Ian]

Lakeside Garage at Wraysbury are very good