Chevrolet - Trailblazer :: 2003 4.2 Engine Idle Surge With AC Compressor
May 11, 2016
The ac condenser unit will click every 7 seconds followed by a 3 to 400 rpm surge for 5 seconds or so, drop rpm then repeat. Belt looks fine, no slipping, new plugs a month ago, newish air and gas filter, does it in neutral or drive, read many ideas from low or high freon, iac, throttle body cleaning, o2 sensor? no codes thrown. Maybe coincidental but was discussing o2 upstream sensor recently on this board. The car experiences the same symptoms while driving.
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2004 Trailblazer 6cy. 2WD - has been experiencing a very rough idle, engine shudders - no matter how long it's been warmed up. Wants to stall off red lights and at very low speeds. Not throwing any lights yet - but the speedo is out ( a cam shift typical problem for this car) so I don't trust the console for lights. Worse when the heat or air is on. Rides fine with more gas/higher speeds. Definitely worse in colder temps but continues even after 40-50 mins of driving. I've heard a number of things, but can't afford to fix them all. I've heard plugs, dirty throttle camshaft, sensors, cam actuator solenoid, etc. All seem to have people who said it fixed and didn't fix the issue. Worried I'm going to stall pulling off a stop and rear end someone any day now. Where do I start!?
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I just replaced spark plugs and now it is running rough and reduced engine power light is on. did not mix up wires or coil packs. did one at a time.
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I have a 2003 silverado with a 4.8 engine. i bought the truck in the summer of 2010. no problems in the winter of 2010. ran great all year in 2011, then my block heater shorted out in the winter of 2011, so i wasn't able to plug the truck in.
We get some cold nights up her in alberta, but anything below -10c the truck would idle surge and stall, would do this about 4 times in a row then it would just surge a few times but stay running.
I had a buddy that's a gm drive ability tech take the truck and do a tone of updates for the throttle body and to correct idle surge and some other drive ability related stuff. i cleaned the maf, map and tps as well as the throttle plates. replaced plugs, wires, air filter and fuel filter. all this and it was still doing it, but it had to be really cold to stall.
wasn't able to replace the block heater till this summer. but now that its getting colder and dropping below -10c at night the truck is starting to idle surge when i start it up in the morning.
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When I go to crank my car in the morning or after its been sitting for a while... It turns over but won't crank but when I turn it back and immediately crank it again it cranks right up...
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Wife's 2002 model, 104,000 miles on vehicle, but recently developed a tat-tat-tat noise when first turning the key. Sounds electrical. What may be causing the noise?
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2003 Trailblazer 4.2... Two times now, like every other start oil pressure gauge is 0. The engine runs fine, oil level is fine, thinking of replacing pressure switch, ie sending unit after checking connections of course
. Was curious this is a simulated pressure gauge as I read on some other posts?
Supposedly the gauge unlike the stepper motor I need to replace for the speedometer is actually voltage controlled by a circuit board in the cluster.
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Trailblazer 2008. This has happened 6 or 8 times. When fuel tank is 1/4 full or less, decelerating downhill from 50 mph to make a right-hand turn, the engine stalls as I reach the turn. Of course I lose power steering and brakes.
If I stop in that downhill position, the fuel gauge reads ZERO but the Low Fuel light is not showing. Turning the key to restart does not restart the engine but if I roll to a flat piece of road or to an uphill position, the engine starts immediately on turning the key. The fuel gauge continues to show ZERO until I turn off the ignition completely and restart. Then the fuel gauge immediately returns to indicate 1/4 full.
No warning lights of any kind show on the dash. There is no question of the gauge showing a false 1/4 indication when the tank is actually empty, since I can drive for 30 miles after the incident while the gauge slowly drops lower until I fill up again with gas.
SOMETHING tells the engine it has no gas so it stops. No stutter or indication of fuel starvation. Simply an engine shut-off.
I tried to reproduce the effect immediately after it had happened by turning the car round and retracing the route, but it did not happen a second time at that location, but it did repeat a few hours later at another intersection.
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Having trouble turning my wheel both ways on my trail blazer. Just replaced wheel bearings on truck not sure what would causing this. Also tries are wearing down..
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Speedometer in 2003 Trailblazer is showing wrong speed intermittently. Seems to be a known problem to GM. Is this something I can fix myself?
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When I put my 2002 TrailBlazer into 4WD, it seems normal as long as I have my foot on the gas, but when I am "coasting" or just slowing down, the car feels like something is dragging on the engine is dragging--sort of like when one tries to drive with the parking brake engaged, or like when you shift to a lower gear in a car with a manual transmission and it slows the engine down. I don't recall this being a "feature" I've had before.
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My truck has been having idle surge, low engine power, says stable tracks is off, computer said TPS pedal sensor. I replaced it. Within 3-4 days my truck does the same thing. I turn it off and eventually my truck runs fine with the exception of my engine light is on truck runs good. I put the computer on it again while the truck running bad and it continues to say it is the TPS sensor.
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I have a 2006 Chevy Trailblazer LS/LT 4.2 liter 2wd. I have been trying to get it smoged, but can't clear the code. P0171 - Lean Bank 1.
I've been having a parts throwing contest with it, but it has been winning and my wallet is losing.
I have changed the air filter, cleaned the MAF sensor, changed both O2 sensors, changed the secondary air valve and relay. I've done the carb cleaner spray test around the intake and vacuum lines, with no spikes in RPM.
Most recent try was a couple bottles of Techron concentrate with premium chevron gas.(still waiting to see if the code hits again)
Next steps are checking the intake bolts(to see if they are torqued) and intake gaskets, check for exhaust leaks at the exhaust manifold, and checking the MAP sensor.
Freeze frame data from the most recent hit on the code is below.
***Fuel system 1 - CL***Fuel system 2 - NA***Calc Load(%) - 30.2***ECT(deg c) - 48***STFT B1(%) - 3.9***LTFT B1(%) - 22.7***MAP(kPa) - 33***Eng RPM - 809***Veh speed(km/h) - 0***Spark Adv (deg) - 10.5***IAT(deg c) - 20***MAF (G/s) - 5.82***TPS(%) - 15.3***Air status - NA.
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The revs surge from low idle to high (about 1000 rpm) every few seconds, but only when the truck is in gear,and the AC is on. What it could be. Also is it something I could fix myself? I have been driving with out the AC for a while but going into summer I need it on.
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I have a 2004 Trailblazer LS with the 4.2L I6 and this problem just recently started and I found this video on youtube of someone having the exact same problem. [URL] ....
This noise is only there in reverse and drive. If you put it in park or neutral it goes away. Also goes away if you give it some throttle while in gear.
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My 2003 6.0 has started to surge at idle after driving for awhile. Like when I drive to work (30 min) and pull off the interstate the idle will bounce around at the stop sign (only jumping like ~100rpm). Does this sound like the ICP to you? I've replaced it once before and am wondering if it's time to do it again?
Also the truck will sometime be hard to start. And when I say hard to start I mean turn the key, let the GP cycle the turn to start and it just cranks. But as soon as I turn the key back off and cycle the plugs again it'll fire right up. It doesn't seem to matter if it's hot or cold. It's been doing it since I got the truck. It seemed to get better after the 1st ICP but didn't completely get fixed.
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I have a 2003 ford Explorer xlt v8 4.6 with a P2197 code.(02 sensor bank2 sensor1)...
I had code P2195 a few months ago and replaced that 02 sensor but just recently truck threw code P2197 and is now starting to idle surge when I stop at a light or just leave it running in park.
Replaced PCV valve and the hose that goes from pcv valve to IAC also replaced Fuel Filter. Cleaned IAC, Throttle Body and MAF did the old check for vacuum leaks with can of carb cleaner nothing found.
Pulled all coil packs off checked OHMs all read .6,coil boots looked to be in good shape going to replace spark plugs and 02 sensor.
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Recently I have noticed that when on a tune other than stock I am getting a surge at idle - my RPMs drop to around 621-630 then shoot back up to 660-675. On my stock tune my RPMs stay around 640-667 and don't cause the surge (felt as a shimmy so to speak). Is there anything else that causes a similar symptom? I attribute it to tuning due to it only happening when running anything but stock but could be wrong.
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have an issue with my 03 trailblazer. i have the problem of no start when key turned to start position. actually nothing happens when the key is turned to start position. dash comes on when key is turned to on pos tho. took battery off and had it tested and it is at full charge. took starter off and had it tested and it passed. checked ignition relay cavities per this youtube video "Chevy Trailblazer no crank testing and information" and there is no light when touching the ground request cavity and turning the key to start position.
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My boost gauge is bouncing around during the flutter at peak psi? I have a apr stg 2 evoms intake and full tbe exhaust 42dd...
Here is a exact video of the flutter i am talking about [URL] ....
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I have 01 F550 6spd 4x4. sounds rhythmic, smooth at idle but just over 1200 is a pattern surge but doesn't sound like one cylinder, cel is off, ICP and pigtail changed as it was leaking , no change. From what I've read duty on ICP and IPR should be about same % I've included the codes I've gotten, I have the epc disconnected right now as I thought it was a wastegate issue, checking the ICP plug next,anything I've missed? It had a cyl 8 contribution at idle which I hear is common? Will changing CPS work with that one? Think it's a grey one. There's no water in bowl I replaced filter, since replaced ICP, pigtail, and bleeding fuel bowl and new filter the codes are gone but still misses, will be checking uvch, injector buzz test showed no faults. Old diesel guy said to flood with Stanadyne fuel treat?
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