Question about 1998 Chevrolet K1500

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Engine surgeing i have a 98 1500 w/4.3 w/5 speed engine surgeing like the a/c is kicking on and off real fast noticed the problem after fuel fill up seen new 10% ethenol sign on the pump and lost about 50 miles on every tank on gas since then about three tanks ago

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You may want to look at your egr beacuse if it gone bad the engine will surge at take off all so check your injecters they may going bad

Posted on Sep 22, 2008

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Posted on Jan 02, 2017

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Buick Lesaber, Lower then 1800rpm most time runs fine, Once in while surges high rpm's like driving fast 1900 & above rpm bucks /2100 smooth's out.


Need to take to a shop with a GM tech 2 or higher scan tool. These tools can actually display various sensor readings and voltages in real time and can be used while driving the car to recreate the issue. These are super expensive scan tools so most shops don't have them. Call around or bite the bullet and have a dealer do it. The money you spend on a correct diagnosis will be saved by not throwing random parts at it based on guess work.

Nov 01, 2016 | 1995 Buick LeSabre

2 Answers

What is causing the fast Idle and slowing down


well gee, there are 50 reasons.
did you scan the PCM yet, if not ,why not?
when the idle surges, that means.
NO RPM ranges stated, if super low rpm check EGR.

1: engine lean and ISC dead, or cant handle the huge engine power drop..The PCM can even make this worse!, buy hunting the ISC to find spec, idle and failing... to...
2: or any of 50 other things causing huge engine power drop and PCM can't maintain idle controls.
super lean burn.(bogging)
super rich burn, misfire for 50 reasons.

i cant hear your engine,nor feel it, or see it shake from gross misfiring.
no can i drive it and see/feel power loss,
can I?
asking net bunny's this (blind as bats)
is "OVER THE TOP" no?
so here , ill toss the dice for you
and guess gross misfiring.
ever get a tuneup this decade, if not bingo , no?

and the others...

http://jeepdied.com/Misfire101.html

link even has the 50 cause list, to show the futility of guessing!
we do 1 to 10 tests. and find it.
for sure.

as you can see EFI systems are complex.
gue$$ is not only expensive but can net you 2 problems easy.

Feb 05, 2016 | 2002 Jeep Grand Cherokee

1 Answer

Engine surges


try fuel filter if doesnt work check fuel pressure sounds like fuel pump if not filter

Jan 10, 2014 | Cars & Trucks

1 Answer

The car is all on normal condition until I filled the gasoline to the fuel tank (over the standard value) ,I left the gas station suddenly the speed goes down then the engine stopped , I try to ignition...


You overfilled the tank and screwed up the fuel vent canister. Usually the car will not run, dies while idling, or surges if you try to drive, also if you try to fill up again you might find it difficult to fill your tank fast because the canister is not venting the tank

Oct 21, 2013 | 1986 Mitsubishi Space Wagon

2 Answers

22r carb dumping fuel at 2500 rpm will not pass smog.Was rebuilt and is in smog specs. at idle.


Fill the tank up but do not top off.

Ran the trunk for 15-20 minutes on the highway and recheck the fuel surge condition at 2500 rpm.

If it stop surging then you has a weak fuel pump.

Change the fuel filter will also help.

Also check the fast idle setting.
==
If everything checks out then set a smog check appointment in the EARLY MORNING.

Jul 05, 2009 | 1986 Toyota Pickup 4WD

1 Answer

97 lesabre surges


Check engine light on ? Have it check for DTC'S diagnostic trouble codes . New fuel pump ,new gas cap,because check lite comes., just replacing parts is not the way to fix car's ! Testing the fuel management system ,viewing scan data on a capable scan tool is. Your best bet take it to a qualified repair shop. What are the fuel trims at +- 10% Do you know what short an long term fuel trims are ? The computers ability to control fuel delivery . What's mass air flow sensor data parameters , coolant temp sensor ,are the O2 sensors switching correctly ,
mechanic now thinks it might be in the charcoll pollution canister??? this surging is driving me nuts ???????? You better find a real automotive technician .
007 Idle Speed Problems Scan Data for Idle

Sep 12, 2017 | 1997 Buick LeSabre

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