TD42 surge (miss) under acceleration
Submitted: Sunday, Apr 11, 2004 at 01:53
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shortgq
Hi all,
I have a 91 GQ SWB TD42 with 240000K's, regularly serviced and was TOLD that the injectors were serviced about 100000Km's ago, but no confirmation about the injectors.
I have an intermittent problem where the vehicle surges, actually feels more like a miss (fuel starve ??) whilst under acceleration, usually at around 3000 revs, then revs higher with no problems. It doesn't happen all the time, only when it wants to.
The vehicle blows no black smoke accelrating, just a light
grey under heavy load. I have started using a fuel additive to combat water, replaced the fuel filter with no change.
The vehicle runs sweet up to 3000 revs, does not appear to lack power and on the times when it doesn't do it, revs right up to red line without drama. No one has been able to give any definate answer to my problems, so was curious if anyone else has suffered this annoyance?
Could it be a symptom of faulty injectors or pump??
Any suggestions would be appreciated, as i am 9 days away from heading into the
Kimberley.
Thanx in advance..
Reply By: CMB - Sunday, Apr 11, 2004 at 16:36
Sunday, Apr 11, 2004 at 16:36
The filter is super fine and only just fits in the hole left buy the banjo fitting (under a spring that goes in one way only - it has a smaller coil one end that rests on the filter).
I doubt very much you will see it with a light and suggest very strongly against a screwdriver. You don't want to damage it. The jigger ensures the spring and filter come out in one go and is not lost.
Electric fuel pump - the diesel guru says the problem is with the pressure difference that occurs under quick acceleration from one side of the pump to the other (something like that anyway). I have had my pump and injectors overhauled a few weeks ago and have not felt the "miss" but I have left the fine pump filter out as
well - less restriction.
New fuel pumps don't seem to run with this filter anymore.
Don't light up without a permit.
Cheers.
Chris.
AnswerID:
53886
Follow Up By: shortgq - Sunday, Apr 11, 2004 at 18:09
Sunday, Apr 11, 2004 at 18:09
I still don't appear to have one, i can see a spring inside the pump, but it is on it's side and appears to be wrapped around a pipe running horizontally inside the pump. I hope that's not the spring, i don't think so as it appears to be
well fixed and not rattling around loose. I can only guess that if there was a filter there, it is way deeper than the thread depth for the banjo bolt, as i can see a fair way inside, certainly past the most obvious area for a filter.
The bizarre thing is, I have put it back together, bled the system and it 'appears' to have cured it. I am wondering if there was maybe a touch of air in the system, could that cause it, or I poked my screwdriver through it the 1st time and now have great flow. Being an intermittent problem, it will no doubt return tommorow, just on the
test run, it showed no signs of missing at all, that is unusual.
i hope I am looking in the right spot for the filter.
FollowupID:
315559
Reply By: CMB - Sunday, Apr 11, 2004 at 18:40
Sunday, Apr 11, 2004 at 18:40
On the GU the banjo is a vertical affair on the front side of the fuel pump close to the engine block. The spring and the filter are obviously vertical as
well..
I thought the GQ was the same (old work vehicles are GQ's) but they may
well not be.
If in doubt, I can send you a digital pick.
PS: I am told that when diesel guru's work on these pumps, they usually don't put the filter back in as the newer ones did not even have one. Yours may be already removed.
The air could have had a lot to do with your problem.
Chris.
AnswerID:
53895
Follow Up By: shortgq - Sunday, Apr 11, 2004 at 20:41
Sunday, Apr 11, 2004 at 20:41
Chris,
My banjo is pretty much on top of the pump, very easy to get to, i hope I pulled the right thing off, I just followed the fuel line down to the pump and found a banjo, looks like it has a screw in the middle of it, yeah its the right bit - I hope!!
Maybe it was a bit of air in the system, I am not sure what the symptoms are for that, but I would expect the service people would bleed it properley, surely. They put the filter on, do the servicing, i will be amazed if it was something that simple, but i hope it is. I'll let it sit overnight and see how it runs tommorow.
if it s not too much trouble, I would appreciate a picture of your pump, too see how much different it is to the GU, that would be great. Email to
2bukoo@swiftdsl.com.au only if it is no trouble.
thanx for the input.
FollowupID:
315578
Reply By: Truckster (Vic) - Monday, Apr 12, 2004 at 21:01
Monday, Apr 12, 2004 at 21:01
I would have the pump checked out by someone else apart from your usual bloke who you state doesnt always do the best work..
I would probably get the injectors done too, since your heading on a trip, and dont actually know if they have ever been done..
Check the fuel system for an air leak, using a piece of clear hose you could see if there are any bubbles in there.
Replace the rubber hose from tank to metal hose, and
check the metal pipe for splits, or wet areas on it under the car.
Ive heard of people putting secondary pumps in the tank on Diesels to feed more juice to the engine but that was only on a few comp trucks that were really going hard.
The mesh is only on later models (if I remember correctly),
mine 91 doesnt and never had it either.
AnswerID:
53958
Follow Up By: shortgq - Monday, Apr 12, 2004 at 23:31
Monday, Apr 12, 2004 at 23:31
Thanx Truckster,
I appear to have solved it, took it for a good run today and it hasn't come back, it sounds like maybe some air was in the system which is annoying as it was easy to fix. Annoying not because it was easy, because it has been a problem for a few months now and no one in the motor industry could cure it for me.. I never even thought of bleeding the system properly. Never assume a workshop will do the easy stuff..If it returns, i will try the clear hose and
check everything through to the tank.
As for the injectors and pump, they will have to wait until I get back, I have thrown too much money at it in the last few weeks preparing it for this trip. I am happy they should be OK.
I will have to try and figure out who to take the vehicle to for the pump and injectors when I return. I just don't know what to do there. I go to one of the most reputable 4wd centres in my area, the majority of work is good, but i keep discovering small things that should have been picked up in basic service and also some work which had been fixed with thread tape and 'emergency' type repair which has really pi&&ed me off, as they know the vehicle is about to go away for some time. i will sort it out..
Anyway, thankyou for your input, the vehicle is running sweet now, I just want to get packed and head north.
Cheers
FollowupID:
315631
Follow Up By: Truckster (Vic) - Tuesday, Apr 13, 2004 at 21:44
Tuesday, Apr 13, 2004 at 21:44
As for the injectors and pump, they will have to wait until I get back, I have thrown too much money at it in the last few weeks preparing it for this trip. I am happy they should be OK.
Maybe worth gettin checked BEFORE you go, would suck bum to have the fuel pump go fluff in middle of nowhere. you would root the queen mum at that point in time to have spent the $$ on the fuel pump!!
enjoy the trip
FollowupID:
315737