Question about 1995 Chevrolet Suburban
I read your replies and the first thing that came to my mind is the ignition coil.
They are common for internal failure and reduces the amount of available spark.
At highway speeds more ignition power is needed to avoid misfiring.
To test the coil have a spray bottle with water and a touch of dish soap in it. Wet the coil with the water with the engine running and see if the truck quits or runs rough.If it does, replace the coil.
This is best done in a dark area as you will often see the spark jumping off the coil if it is defective.
I hope this helps you find your problem.
Posted on May 01, 2010
Have you cleaned the throttle body?? Seems like something simple but
it also can be overlooked. Those throttle bodies are famous for the rod that the throttle plate
rides on getting worn out. Especially with those kind of miles. It may
be closing too much or be dirty.
I highly recommend any one who is having idle stalling problems to remove and clean your Throttle Body. GM in my mind made a serious design flaw when engineering there system by eliminating a Idle Air Control Valve. Instead they machined a small opening (on one half the dia. of the TB bore) in the throttle body the prevented the throttle plate from closing completly. Well as soon as carbon builds up on the back side of the throttle body from the EGR then the machined opening starts to get restricted. Once the electronic throttle servo/motor can't compensate then you start having stalling that will only get worse until the Throttle Body is removed and cleaned as well as the inlet to the intake manifold. This info was passed on to me by a GM dealer Parts and Service manager who owned one as well. I followed his advice and have had NO issues for over a year. Keep in mind that this will be requied service evrey couple of years as needed to prevent or eliminate the issue as it will return due to the design.
Try it. Hope this help to solve it.
Posted on Apr 30, 2010
Hi, the first thing you should go and do is to go out and buy a fuel line cleaner, you can buy these from most filling stations and all car spares shops, its cheap to buy and should solve your problem.
One of the best brands is called Red X just make sure you buy correct type ie petrol or diesel once you have the correct one read the instructions on the back of bottle.
Now it will tell you to pour the cleaner into a full tank of fuel, but dont do this as your sounds quite bad just have half a tank of fuel then add all the fuel cleaner or the amount it says.
Once you have poured it into you tank you need to then go for a drive, now for the first 15 min drive normal this gives the cleaner chance to work around the whole fuel system and injectors, now after these first 15 to 20 min you then need to drive a bit harder so accelerate a bit harder when you pull away from lights etc doing this puts the injectors under more pressure so it then cleans them better.
then drive harder for about 15min this should ensure the fuel line and injectors have been cleaned properly.
If after doing this your still having problems then i would get the fuel filter changed and if then it still has problems i would think about getting the injectors changed, how ever the fuel line cleaner should solve your problme.
its worth noting that using the cleaning product every couple of months will ensure your car is running perfect and it also improves mpg so it saves you money in the long term, dont buy a cheap cleaner as they never work so remember to go for mid range to expensive but even the expensive one will only cost about 10$us or 8 pound sterling depending on where you live as i am in uk it would be sterling price but as your talking about a chevy i take it your talking dollars.
let me know how you get on or if you need further assistance ok
Posted on Apr 30, 2010
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Posted on Jan 02, 2017
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