Question about 1995 Chevrolet Suburban

3 Answers

I have a 95 chev suburban 4x4 5.7L. the truck starts and idles great, runs fairly well in low speeds, but get on the highway and at about 55 it feels like it is cutting out. Also, under load or going up hil it really starts missing. just change spark plugs, wires, rotor, cap. thanks

Posted by on

  • 1 more comment 
  • sbjn07 Apr 30, 2010

    I have used sea-foam a couple of times and changed fuel filter.

  • sbjn07 Apr 30, 2010

    I will clean the TB and get back with you. Thanks. I did want to tell you that the truck still runs. Starts every time, good idle, never any missing slowing down or low RPMs. No code has been thrown, so does this change your diagnosis. Thanks again.

  • sbjn07 May 06, 2010

    Yes. Thank you somuch

×

3 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 1,168 Answers

Hello sbjn07.
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.

KL

Posted on May 01, 2010

  • FUBAR May 06, 2010

    Thank you for taking the time to rate the answer.
    It is appreciated.

    KL


×

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Chevrolet Master
  • 17,970 Answers

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

  • ZJ Limited
    ZJ Limited Apr 30, 2010

    02 sensor is not you main problem. Have you got good spark and fuel pressure when it acts up or quits?

    Is it dead now or just acting up?



    Pull the throtle body and replace the base gasket to start with. Clear codes and see what comes back.



    Check fuel pressure when it quits. Post back fuel pressure readings. Get some good repair info on the code for fuel pump relay and fuel pump
    and fuel pressure.

    Let us know how it goes.

×

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 4,102 Answers

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

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

1999 mitsubishi montero sport. Randomly started hesitations and low rpms in gear at idle. and highway speeds dropped rpms slightly and when let off accelerater rpms drop too quick and low. Any ideas?


Engine light on? Many things can cause this. Mass airflow sensor, throttle pos. sensor, cam sensor, idle control valve, O2 sensor, vacuum leak etc, diagnosis be great. Good luck

Feb 11, 2017 | Mitsubishi Cars & Trucks

1 Answer

95 chevy 1500 4x4 cuts out at highway speeds


sounds like balljoint not installed correctly

Dec 16, 2013 | Chevrolet Cars & Trucks

1 Answer

2012 brand new suburban rough idle


I too have brand new 2012 Chev Suburban with rough idle. Dealer says "operating as designed" but admits to lots of complaints.
Call me at 516 671 1295
Donald T. Rave, Jr.

Jun 19, 2012 | 2012 Chevrolet Suburban LS 1500 4dr SUV...

1 Answer

Have 95 model Mazda e2000 econovan stalls idles set to low also on highway going up hills feels like runs on 3 cylinders and then goes back to normal and fitted a thermostat in it today no leaks just not...


Did the vehicle overheat?Feels like it runs on 3 cylinder this is a misfire underload, you are dealing with a misfire from the wires itself to the cap and rotor and even the sparkplug.

Mar 02, 2012 | 2004 Infiniti I35

2 Answers

1995 chev suburban 4x4 350cui has intermitant miss under load


Ignition missfire.
Replace the plug wires, or spray a water mist on them at idle and watch for sparks arcing to ground

Feb 23, 2010 | Chevrolet Suburban 1500 Cars & Trucks

2 Answers

96 tracker overheats at highway speeds temp ok at idle or low speed. Replaced water pump thermostat flushed rad checked hoses. any ideas?


Presurize system with radiator cap on to see if you are holding 10 to 13 LB pressure as high as 17 LB. Get new radiator cap for your radiator. Check for a slow leak at pump hose thermostat conection , is it wet ?
Do you have a Summer Thermostat ?
Vitally

Sep 14, 2009 | 2001 Chevrolet Tracker

1 Answer

Mitsubishi Montero Ls 95, A/T light flushing after 10mins


should be a good place to start, if condition don't improve call in a trans tech

Apr 24, 2009 | 1995 Mitsubishi Montero

1 Answer

Engine runs rough after about ten minutes /idles really low


Just trowing some suggestions out there, but, I would check the idle air control valve (solenoid) or the throttle position sensor. If they check out then my last guess would be the map sensor or the vaccuum to the map sensor. Hope I was able to help. Best wishes.

Jan 16, 2009 | 1991 Plymouth Laser

Not finding what you are looking for?
1995 Chevrolet Suburban Logo

Related Topics:

161 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts

yadayada
yadayada

Level 3 Expert

75051 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

7726 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...