Question about Cars & Trucks

1 Answer

1996 chevy suburban run bad ive replaced fuel pump fuel filter fuel regulator coolant temp sensor plugs wires cap rotor timing is correct cleaned maf has reman engine w/40k on it

Posted by on


1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert who has written 2 tips or uploaded 1 video tip.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 7 Answers

There are many things that can cause a vehicle to run bad and it looks like you've tackled a large portion of them. I'll just add a few more items to check to help with solving it.

First thing I would do is, with the engine running, listen for any vacuum leaks. It will be an audible hiss that, if large enough to cause poor operation, will be easily heard over the sound of the engine. Using a piece of rubber hose with one end to your ear and the other end pointing at various components of the engine can really be helpful in pinpointing the exact location of the vacuum leak. If found, repairing this will improve engine performance, regardless of whether it solves your current issue or not.

Next, oxygen sensor(s) are a prime suspect. If you can, hooking up a scan tool, you can see if there are any codes. A scan tool that can graph the voltage of the upstream O2 sensor can let you know if the sensor is working or not. It should go up and down once or twice a second, with voltage readings between around 0.1-0.2 up to 0.8-0.9 . If it isn't varying around at all, then it will need replacement.

After that, testing the Idle Air Control Valve (IACV) is what you want to look at doing. It's simple to inspect, test, and replace. First, remove it check the pintle for excessive carbon build up. Clean it off with carb cleaner. Next, you need to perform an ohms test. With the connector unplugged, perform the following tests:
Measure resistance between terminals A and B.
Measure resistance between terminals C and D.
-These two readings should be between 20-80 ohms. If not, replace.
Measure resistance between B and C.
Measure resistance between A and D.
-If not infinite resistance, replace.
Here's a wire diagram for the IACV.1996 chevy suburban run bad ive replaced fuel pump - 0996b43f80219b22.gif
Next, remove the EGR valve to see if it's dirty. If so, clean it. If it is bad, it would most likely have an engine code associated with it, and a dirty EGR is a more likely culprit.

Next, test the Manifold Absolute Pressure (MAP) sensor. You'll need an volt meter for this one. With key ON engine OFF, back probe (as in, keep it connected to the sensor and probe the connect/wires) terminals A and C. You should get the 5 volt reference signal. If not, the wiring or the ECM is bad. Now probe between A and B. With engine off, it should read about .5 volts at sea level. Now turn the engine on. At idle it should read ~1.5 volts and it should read ~4.5 volts at wide open throttle. If not, inspect for vacuum leaks or replace the sensor.

That should pretty well cover the water front for possible solutions to your poor running engine. Hope that helps.

Posted on Dec 12, 2013


4 Suggested Answers

  • 2 Answers

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

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this 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.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


SOURCE: 2001 Chevy Astro Van

buy a Honda or Toyota, they work

Posted on Sep 26, 2008

  • 15 Answers

SOURCE: 1996 GMC Sierra 1500 XC 4x4 5.7 Hard To Start

It is probably the fuel pump. If I remember the number correctly, this fuel system needs about 50 lbs to open a valve.
Until this valve opens, no fuel gets to the fuel nozzels.

Posted on Apr 30, 2010

  • 1 Answer

SOURCE: I have a 1997 Mitsubishi Galant with rough idle

I am having the same issue on Mitsubishi Galant 02. Clattering on acceleration, herky jerky idle. Pulled a code multiple cylinder misfire. My mechanic's diagnosis is bad valve cover gasket causing oil to seap into the spark plugs and bad timing belt, which I have not replaced at 150k miles. I do however know my fuel injectors do need cleaning, he hasn't ruled that out either. Have you pulled any code on it? I have read on engine knock sensor going out on some of these also. Hope this helps some.

Posted on Oct 22, 2010

Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

Hard starting 1996 ford f250, engine jerks sometimes while driving

air temp sensor or the MAF needs cleaning i would of thought, if upspeed is fine then this would be the problem.

Jul 26, 2017 | Ford Cars & Trucks

2 Answers

I have a 2002 Blazer and it is hard to start we replaced fuel pump,fuel filter,crank sensor unit , oil line ,oil pressure Gage, did Tune -up Rotor button ,rotor cap wires spark plugs

by not running the fault codes first , you have missed the real faulty sensor that is causing the problem
nothing of what you replaced is linked to hard starting, like , ambient temp sensor ( used to report the air temp for the setting of the rich mixture need for starting)
baro sensor ( used for reporting the air density used to set the mixture setting
Maf/ Vaf sensors ( again used for mixture settings)
heated oxygen sensors ( used to adjust the gas composition by reporting the results to the ECM

May 06, 2017 | Cars & Trucks

1 Answer

1996 chevy suburban runs bad has new fuel pump, fuel filter,plugs wires cap rotor fuel regulator coolant temp sensor cleaned maf reman engine with 40k on it

Check if the spiders are bad... I May be off a year with application but if the spider was never replaced you are due. spider is the part that plugs into manifold to each intake runner for fuel injection, The plastic tubes get brittle and start to dribble. when one or more brake you get raw fuel not atomized fuel.

Oct 13, 2013 | Chevrolet Suburban 1500 Cars & Trucks

1 Answer

Won't start in Cold weather in Warm Weather it's fine

without actually hooking up a scan tool and looking at the pid data i would say you have either a coolant temp sensor issue or intake air temp sensor issue.i have seen alot more coolant temp sensors bad than the intake air temp sensors tho.

Feb 17, 2013 | 1996 Jeep Grand Cherokee

1 Answer

My suburban stalls and sputters out after running for about 15 minutes. I have replaced all the O2 sensors, plugs, wires, crank sensor, oil change, fuel filter, cap and rotor. What else could be the...

need to check the fuel pressure.and if its blowing black smoke,the fuel pressure regulator is bad.the fuel pressure should be around 65 pounds.

Mar 27, 2010 | 1999 GMC Suburban

1 Answer

Hesitation while exceleration

Have these things checked for #1:
Spark plug
plug wire
#1 fuel injector
and the throttle position sensor, also have a fuel pressure test done, especially for the hesitation.

Aug 08, 2009 | 1996 GMC Suburban

2 Answers

Engine cough

Go to Auto Zone and have the Suburban scanned for DTC codes, Auto Zone scan for free and most Auto shop will do it for $10.00 to $20.00 since they want your business cause they know most large Auto Parts store scan for free.
It sounds like you have a miss fire which can be caused by and O2 sensor or dirty MAF sensor which can be cleaned or time to replace the rotor and cap, plug wire and spark plugs.
Note that the distributor cap and rotor is made of plastic and is know to crack do to time and heat. There is also a rubber valve or screen at the bottom of the distributor that get's dirty and the inside of the distributor collects with condesation and corrode the rotor and caps too.
Good luck and hope this helps, Get it scanned and see if it's a sensor that is causing the miss fire on the hightway. If not then replace the cap and rotor and clean out the distributor if needed. Inspect the plug wire and replace if needed and change the plugs.

Keep me posted. be glad to help you out.

May 28, 2009 | 1996 Chevrolet Suburban

1 Answer

I have a 2000 Chevy Blazer I have replaced

maf sensor, tps sensor,or timing gear

Apr 16, 2009 | 2000 Chevrolet Blazer

1 Answer

1996 suburban random misfire or runs rough changed the following sensors: O2 (all four) MAF IAT ECT and PCV, air filter, water pump (flowkooler), thermostat, cleaned ground connections then I added Lucas...

i would check the fuel pressure first if it is in the good ranges then your pump is good. have you checked your spark plugs and wires? if not i would, if bad replace. otherwise i would have the ignition coils checked to find out if they are working correctly. that is all i can think of. good luck

Dec 16, 2008 | 1996 Chevrolet Suburban

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

58 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts


Level 3 Expert

80339 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

john h

Level 3 Expert

15148 Answers

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

Answer questions

Manuals & User Guides