Stuttering 280GE 1988

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Sat, 10/10/2015 - 16:16
kman
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I am in the final stages of renovating a 1988 280GE 2.7L.  A couple of engine issues.

The truck was in a back garden for 3 years siting there previously. I have replaced fuel pump, oil filter, recon fuel distircbutor new throttle linkage parts BUT in teh morning times it just stutters/jumps as i try to drive it. It might even blow out the back once or twice but not often. As i go through the day when i start it it takes some time for it to get into it's groove and drive right as it stutters to get up a pace. It feels like fuel is not getting to engine but parts have been replaced...help is very much appreciated guys...thx Tony

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Sat, 10/10/2015 - 16:29
#1
neilmarton
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Re: Stuttering 280GE 1988

Hello Tony,

Have you checked spark plugs, HT leads and distributor ?

I had a similar issue and found she was only running on 4 ! She used to drop and feel like she wanted to cut out. 

Good luck

Neil

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Mon, 12/10/2015 - 16:27
#2
kman
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Re: Stuttering 280GE 1988

Thx Neil. Yes i have replaced spark plugs, injectors and new HT leads. I haven't replaced distributor? Is there a way to check this or signs i should look for as look at it from your experience?? Thx Neil...tony

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Mon, 12/10/2015 - 16:39
#3
Russ280
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Re: Stuttering 280GE 1988

Take a look under the bonnet when it's playing up in the dark. You may see some electrical arcing / discharge. If so you've found the problem.
Or try disconnecting one spark plug at a time. If there is no change in how it runs you've found a faulty plug, lead or maybe distributor cap. You need insulate tools or gloves to do this. 12000 volts hurts.
Personally given the history I'd replace all of the ignition system from the distributor cap to the plugs.
 

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Mon, 12/10/2015 - 21:08
#4
kman
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Re: Stuttering 280GE 1988

Thx Russ...Would it be a Cold Start Sensor and is there 2 of these on these 280GE ?

I've pretty much replaced everything accept the distributor cap as it looks good..thx again Russ T

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Mon, 12/10/2015 - 21:48
#5
Russ280
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Re: Stuttering 280GE 1988

You're stretching my memory cells now!

 
I think one alters the fuel pressure by acting on the air flow flap, effectively altering the amount of fuel enrichment.
 
The other is an air by pass allowing more air and raising the idle speed.
 
So yes this could be your issue at start up.
 
I"d suggest Google'ing Bosch CIS. Plenty of stuff online and once correctly set up its a great system. You may need to either find someone with the experience and equipment to measure and adjust the fuel pressure or invest in the equipment yourself.
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Mon, 12/10/2015 - 21:57
#6
Russ280
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Re: Stuttering 280GE 1988

Oh and you can check the correct operation of the injectors by removing one at a time, insert it into a bottle and turn the engine over. You should see a nice cone of fine mist. 
Again from memory I think the injectors are just a push fit.

If it dribbles or squirts a single jet it's goosed
Don't blame me if you blow yourself up or simply set fire to the G.
Y

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Tue, 13/10/2015 - 19:34
#7
kman
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Re: Stuttering 280GE 1988

thx again Russ very helpfull..i'm so new at this i may just set fire to the beast :)

I will try and pin down these two sensors..I will check the repair manuals on this website. Thx man  t

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Sun, 01/11/2015 - 14:24
#8
ErnestTBass
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Re: Stuttering 280GE 1988

Sounds exactly like the problem I had: wouldnt rev just spluttered and or died. The cure was to get the WUR rebuilt: its attached to the block under the inlet manifold and replace the vacuum pipes. I recommend http://www.kmipetrolinjection.co.uk/ and few folks really understand the operation of Bosch CSI systems these days so beware of expensive fishing expeditions!

The air metering flap needs to be clean and not sticking (remove the rubber tube on top of the inlet manifold to check and clean.)

You can also see if pushing down on the flap whilst accelerating the engine helps (if it does it would suggest the fuel pressure is too high and is preventing the flap moving down to let more air in.) If you take the WUR off there was a thick metal pipe on mine which contains a plastic tubular thing (maybe to act as damper) BUT take it out and clean the pipe as it gets clogged and screws up the pressures.

Best to get the fuel pressures checked - needs to be done from cold. Also the rubber vacuum pipes under the inlet manifold need to be sound or replaced. Since the fuel injectors are not too expensive its simpler to just replace them as you have to take them out to check them and if they are pretty old replacing is a good idea.

Also the fuel pump needs to be capable of giving the proper flow and pressure so that has to be checked first.

 

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