Question about Cars & Trucks

1 Answer

I have a 90 silverado 5.7 an it just started to idle very high then low cutting out popping an dying on me. I noticed it will start an run fine until it gets to operating temp. Then it acts like sumone us steppin on gas pedal idles real high then back an fourth to up an down udle. I got a cts code an changed that sensor no fix.so no i have changed iac,mapsensor, tps, fuel filter, fuelpump not even a yearold yet.o2 sensor, brand new wires coil, distributor, rebulit the tbi, cut cat- convertir off. Check egr an gave found no vacum leaks. Tried to chek fuel pressure but both times from two diffrnt parts store they would leak around the fittngs real bad. But it will rev up if u giv it gas just wont idle. I drove it about 10 miles an it just popped bogged down an die. Starts just fine an will idle perfect untill operating temp comes up. Plugs not that old either.its driving me crazy.what could it be? Plz help.

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that hasĀ over 10 points.

    Mayor:

    An expert whose answer gotĀ voted for 2 times.

  • Contributor
  • 34 Answers

Have you tried cleaning the MAF sensor. This sensor is by the air filter box. The mass air flow sensor has to be cleaned with a special spray that you can get at any auto parts store. Do not, I repeat do not use carb cleaner this will ruin it. It is basically a thin filament housed in a grid where the air flow goes through and if it gets coated by dust, oil, or burning to rich black soot this will throw the signal off just enough at the computer.

Posted on Nov 17, 2013

  • jneel64 Nov 17, 2013

    90 silverdo does not have a maf sensor. It has a map sensor which i hav changed.

×

6 Suggested Answers

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

txkjun
  • 409 Answers

SOURCE: 2000 silverado 4.8 v8 runs bad when it is cold out side.

Try replacing the coolant temperature sensor for the injection system.

Posted on Jan 11, 2009

  • 141 Answers

SOURCE: 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.

Posted on Jan 17, 2009

  • 5 Answers

SOURCE: jeep starts and idles perfect no acceleration,

Sounds like the catalytic converter or muffler are clogged. There isn't much exhaust at idle, but when you accelerate your exhaust volume increases, thus if your catalytic converter or muffler are clogged the restrict the exhaust escaping out thus causing an excess of back pressure which won't allow the engine to breathe normally.

Posted on Jul 16, 2009

  • 5 Answers

SOURCE: 1987 Chevrolet S-10 Pickup1987 chevy s10 2.5l tbi

Check the trottle body postioning sensor...

Posted on Jul 19, 2009

pippall
  • 1486 Answers

SOURCE: 1987 chevy S10 engine idle problem

relace the throtle air idle valve.The temp switch will allso cause this problem.

Posted on Jul 19, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

My Durango starts if I give it gas and stalls when I let off the gas won't idle, help what to look for?


My car dies when I let off the gas - CarGurus




www.cargurus.com > Questions > Dodge > Durango












CarGurusDec 5, 2012 - My car dies when I let off the gas - I have a 2000 Dodge Durango SLT, I bought a month ago. I noticed it had a slow start but it still started and ran fin... ... Also, the oil pressure was high until it could idle by itself then it was back to normal. ... sometimes if you give it more gas it stays running but now it won't ...




dodge dakota idling and dying - CarGurus




www.cargurus.com > Questions > Dodge > Dakota












CarGurusApr 12, 2011 - dodge dakota idling and dying - My dakota will start then idle down and die. I can pump the gas and it will stay running but if i hold the peddle down or . ... thatdies on me at stop signs and when I take my foot off the gas pedal. .... and truck pops..misses and runs like crap and wont stay on unless i give it gas, ...




Truck starts but won't stay running...?? - Dodge Dakota Forum




www.dodgedakota.net/boards/v8/4240.html











Aug 9, 2003 - 21 posts - ‎20 authors

Dec 21, 2015 | 1999 Dodge Durango

1 Answer

JUST REPLACED CARB ON MY 1992 CHEVY SILVERADO WITH A 4.3 LITER. NOW IT STARTS AND RUNS FINE UNTIL IT WARMS UP THEN DIES AND WONT START FOR 30 MIN


How many rpm's is it running at when you first start it up and it is running on the choke? Does it gradually start to idle back and then start to die r does it do it all of a sudden and dies?

When running with the choke on, it is on the high idle circuit of the carb, as it warms up the idle should slow down and then idle in the 800 rpm range in Park, 650 in Drive. This will be the low idle circuit range. This transition inside the carb will cover an idle air bleed hole in the venturi of the carb and lean out the mixture. If you notice that the carb smells gassy and black rich unburnt gases are coming from the tailpipe, the problem is located within the carb and requires a carb tech to do a rebuild of the carb. You could try a good carb cleaner like Lucas by putting it into the gas tank, in case you just got a bad tank of gas, but that is just a bandaid for a more deeply rooted problem. Get the carb rebuilt?

Nov 27, 2013 | Cars & Trucks

1 Answer

1990 full size blazer starts fine idles then dies


sounds real easy either a bad idle air control solenoid or more likley a blown throttle body gasket. to test fro a blown gasket, with engine running and cool spray carb cleaner or brake cleaner around base of tb were it bolts to intake. when it hits the bad area, should idle down and be normal for a second or 2. iac is possible,try this first since its so common and let me know

Aug 26, 2009 | 1990 Chevrolet S-10 Blazer

1 Answer

2500hd dies then starts and dies again


CHECK AIR FILTER FOR RESTRICTION. A BAD SUPPLY PUMP. OUT OF FUEL. BLOCKED FUEL RETURN LINE. AIR LEAK IN SUCTION LINE. RESTRICTED FUEL FILTER. INOPERATIVE FAST IDLE. LOW IDLE SPEED AND DEFECTIVE INJECTION PUMP.THIS IS A LIST OF THINGS TO CHECK.

Jul 25, 2009 | 2002 Chevrolet Silverado

1 Answer

Idle high to low


try cheking your timing

Mar 02, 2009 | 1990 Chevrolet S 10 4WD

1 Answer

91 volvo 240 - keeps stalling out, shakes a lot when idling


for the cheapest TEMPORARY solution get some fuel injector cleaner and get on the gas fo about 5 mile at like 100 - 120 miles an hour thats what idid to mine last week hasnt wanted to die out since. good luck.

Oct 13, 2008 | 1995 Volvo 850

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

Related Topics:

90 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts

yadayada
yadayada

Level 3 Expert

75822 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Randy Ohler

Level 3 Expert

14585 Answers

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

Answer questions

Manuals & User Guides

Loading...