By Nicholas McKay
I have a 2004 Suburban that has had a low idle (400 rpm) ever since I bought it. I've also had an intermittent no-start (cranks but won't start) that has been getting worse and worse and usually happens in the winter and it has now begun stalling especially when the engine gets warm. It only stalls when I'm parked. Is there anything that can cause a low idle AND an intermittent no-start? I'll explain the symptoms below.
Low idle: If I just tap on the gas, it bumps up to 1000 rpm, then drops off unusually quickly and dips to about 300 rpm before slowly climbing back to 400 rpm, but it never stalls when this happens. If hit the gas and hold it for a few seconds at 2500 rpm or so and let off, it doesn't drop off as fast. The engine slows down at a normal pace until it hits 600 rpm, then slowly decreases to 400 rpm. I'm going to be cleaning the throttle body and MAF sensor today to see if it helps.
No-start: It's not the security system, since it doesn't fire at all. With the security system it will run for 3 seconds, then die. I have also checked the fuses and relay. Seems to be completely random, it probably starts 50% of the time. These "episodes" come in periods of one to two weeks, then goes away for months at a time. I think maybe disconnecting the battery or a dead battery is what usually sets it off. When this happens, the fuel pump doesn't prime and if I jump numbers 30 to 87 of the fuel pump relay, the fuel pump runs constantly and I am able to start and drive no problem. Using a multimeter, I was able to conclude that there is no ground control signal going to the relay from the PCM. The fuel pump draws about 7 amps, which to me, sounds pretty normal. Aftermarket items include 3 amplifiers for 4 subwoofers and 4 door speakers, Blade_Al with Drone Mobile auto-start, and a newly installed capacitor.
I have recently replaced the battery, since the old one froze and wouldn't hold a charge and I believe it froze because the alternator was not charging properly due to worn bearings. I also upgraded the charging system wiring to 2 gauge to accommodate my sound system.
Last night I got it started and began tugging on every bundle of wires I could possibly find (took 45 mins), paying special attention to wires leading to the PCM and the wires under the steering column and it made no difference in how the engine was running. The only thing that changed anything is that unplugging the MAF sensor increased the idle to a normal rate. Plugging it back in made no difference until the next time I started the vehicle...then it went back to 400 rpm.
Finally, this morning it wouldn't start on the first attempt so I turned the key to "off" and waited 10 seconds. I turned the key to "on" and the fuel pump primed and I was able to start the car 10 times in a row and drive to the store without it stalling. Since I didn't move anything between these attempts, I don't think it could be loose or broke wiring. Could it be the fuel pump control transistor on the PCM? Transistors are not mechanical, so it would make sense as far as how random this problem actually is. Should it attempt a solder re-flow on the PCM as a last resort? It seems like the warmer weather is helping the no-start to a certain degree, but a warm engine still seems to make it worse. Thanks in advance for the answers!
By Justin Arkin
Can anyone tell me where the vertical adjustment screws for the low beam projector on a 2016 suburban with stock halogens are? I recently retrofit the low beam bulbs (which are ridiculously dim) with Morimoto HIDs and need to lower the beams a bit. The Left/Right adjustment is on the back of the assembly, clearly marked and easy to find, but I have not been able to find any adjustment on the headlamp assembly for vertical adjustment, even after removing the plastic air dam that covers the top of the headlamp assemblies.
Any suggestions/information much appreciated,
I've seen several conflicting reports regarding the fluid capacities on both the front and rear differentials on my 07 Avalanche. The manual does a great job specifying the gear oil types but seems to be lacking the capacities part in the "fluids and capacities" section. Anyone have a good answer for me? I sure would appreciate it!
Contributing Writer, GM-Trucks.com
Chevrolet partnered with Luke Bryan to create a fantastic “Huntin’, Fishin’ and Lovin’ Every Day” Suburban Concept. The concept is part of the Chevrolet SEMA display this year in Las Vegas.
Chevy says Bryan started the idea with his wish list for his ultimate outdoor vehicle, with a focus on more access to the open air. “This concept is all about maximizing the Suburban’s space and utility for a family that truly enjoys hunting, fishing and other outdoor activities,” says Todd Parker, Chevrolet Design director. “There’s plenty of room for all their gear, along with added amenities that make the journey more enjoyable.”
Aside from the bling-bling wheels and roof rack, the first things that caught our attention were the removable rear side glass panels. In combination with the open tailgate glass and the custom rear-facing, third-row seats the back of this ‘Burban looks like a great place to ride out to a favorite spot.
“Chevy has been part of our family and a part of our work life on the farm for as long as I can remember,” says Bryan. “If you were a Bryan, you drove a Chevy — and I’m a longtime Suburban owner. This partnership is a natural fit for me and this unique Suburban represents everything I and my family want for our outdoor adventures.”
The modifications to the truck include:
Chevrolet Accessories mesh grille (custom finish)
Chevrolet Accessories black tubular assist steps
Chevrolet Accessories Thule®* Canyon roof basket with optional extensions
Chevrolet Accessories roof rack cross rails
Chevrolet Accessories black Chevrolet bowtie emblems
Hunter Bronze exterior color with Dark Carbon accents and camo graphics
Unique lower fascia
“Huntin’, Fishin’ and Lovin’ Every Day” exterior badges
Roof-mounted light rack by Baja Designs
Roof-mounted fishing rod holder
Swing-out tailgate with spare tire mount
Chevrolet Accessories Bluetooth headphones by KICKER®^
Chevrolet Accessories Bluetooth Bullfrog® music system by KICKER®^
Black and Two-Tone Olive interior color with Anodized Orange and Dark Carbon accents Fully trimmed seats with Argon piping and Platinum camo-pattern perforated inserts
Custom-trimmed steering wheel, door pads, instrument panel and center console with Argon piping and Platinum camo-pattern perforated inserts
Concept rear-facing third-row seats with custom footwell
Reverse-mounted rear-seat DVD player
“Huntin’, Fishin’ and Lovin’ Every Day” concept rear floormat
Re-trimmed headliner in Light Platinum Taffeta material
Chassis and suspension
Chevrolet Accessories 22-inch concept wheels with 35-inch-tall tires
Suspension lift Lower skidplate extension
Tow hooks in Anodized Orange
Chevrolet Performance 5.3L cold-air intake system
Chevrolet Performance front six-piston Brembo® brake upgrade system
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