I have a '91 suburban (1/2 ton, 5.7 TBI) starts,idles and revs great, stumbles at most minimal throttle(parking lot speed) replaced cap, rotor, plugs, wires, filters. Ran injector cleaner thru it, swapped TBI with a known to be working unit...
View 5 Replies2011 Silverado instrument panel dimmer won't reduce below about (subjectively) 40% intensity and cannot be turned off - still way to bright for old eyes on dark mountain roads. Dealer says its characteristic of the model and has no suggestions. Scan-tool results for dimmer potentiometer output reads 2.7 volts (9%) at minimum rotation, and 3 volts (100%) at max intensity. Scan-tool results for LED PWM drive signal reads 0% at minimum and 100% at max. The pulse width modulator (PWM) appears to be an imbedded component of the body control module (BCM) so is not accessible. The dimmer potentiometer is a component part of the headlights combo switch so is likewise not directly accessible.
Since I can't get to the potentiometer voltage divider circuit, if I add a fixed resistor to the output leg of the potentiometer and reduce the dimmer signal voltage by another 0.1 volt (to 2.6 volts out to BCM/PWM) will I set a BCM DTC or raise the voltage on the LED drive pulse to a damaging level? Alternatively, if I place a spst switch in the dimmer output signal, will the PWM simply switch off, or try to further decrease the drive pulse width? Last shot-in-the-dark question before I drag a scope out and start tapping into wires, how to find out what IC chip is used in the PWM?
My fuse keeps getting blown, mechanically and emotionally. My 91 gmc suburban blows the a/c fuse every time i slide the a/c switch to any position. when the fuse goes my emergency brake light turns on and my speedometer stops working. one weird note, my engine seems to run very smooth after the fuse goes, to the point that im not even sure its running but it is. So my question is, where should i start looking to fix the problem? It's too hot/cold in here!"
View 2 Replies1991 suburban randomly dies while driving..... I will only have headlights and interior lights.... no other power .....wait 5-10 minutes fires right up.
View 1 RepliesMy work horse is singing me the blues. It will idle correctly for 1 - 2 sec., then approach death, then idle correctly again for 1 - 2 seconds. It responds as expected when the throttled of opened for 1 - 2 seconds, any longer it will begin to die. This is what I have done so far.
1. Changed the fuel filter. Did not check to see of water was in the filter as I only purchase gas from name brand gas stations. Did not think I could get bad gas from them.
2. Check MAP sensor, voltage signals were close. Changed it out any way. No change.
3. Checked the Engine Coolant Sensor, it is sending the correct voltage.
4. Checked the Idle Air Control Valve. The impedance is as called for in the Chilton repair manual.
5. Checked the Throttle Position Sensor. It appears to be sending the correct voltage as the throttle is opened and closed.
6. Overhauled the Fuel Pressure Regulator. Replaced the spring, diaphragm, and gaskets.
7. Overhauled the Throttle Body. Removed the injector, cleaned all passages with solvent and compressed air. Did not soak the injectors.
In my mind, all that is left is the fuel pump or maybe I did get bad gas.
My 97 Suburban died and will not start. Things I have done:
1 Changed fuel filter
2 Changed fuel pump twice
3 Checked fuel pressure 60psi
4 Changed plugs and wires
5 Changed rotor and cap
6 jumped switch to make sure pump runs
The Suburban will start only if I pour gas in the throttle body and will idle as long as I continue to pour gas in but will die when I quit.
So I have a 91 Celica 1.6L and the problem Im having is that it does not want to turn on with just the key. If I spray Starting Fluid into the throttle body then turn the key, it'll turn on and stay on and even drive without any hesitation. I did the diagnosis test with the jumper wire and the codes I got were :
Code 22: Water Temperature Sensor Circuit Fault (New Sensor)
Code24: Intake air temperature signal fault
Code 32: Air flow meter circuit or vacuum sensor signal fault
I never owned a toyota prior to this so I don't know where to start looking for a solution.
My ranger is an 89 but it's got a 91 motor in it, 2.9 V6. When I accelerate it hesitates before actually accelerating which makes me think the TPS is bad. Probed and tested and I got .85V throttle closed and 4.65 at wide open. Specs call for .8V - 4.5V
I'm not sure if there's an allowance of fluctuation, but is that high enough to point out a bad TPS? If it's not the TPS, is the ignition timing off or what else could it be?
I have a 91 camry that failed the CA smog test because it lets out a puff of smoke when you floor and release the throttle. Could it be anything other than the rings?
View 2 RepliesIf sensor or control module malfunction. Brakes are fine. If ABS relay, so where is it located, cant find in fuse box. This is a 1500 2WD suburban.
View 5 RepliesMy 2003 Suburban shakes when I drive over 70 mph. I don't know if the tires need realignment?
View 4 RepliesI have a 1990 suburban that has had a rebuilt x-mission about 50,000 miles ago. At this time when I drive there is a hesitation, split second, when running on flat road. It happens when going up a hill, too.My mechanic said change the: plug wires, then the plugs and rotor. No difference.
I think the thing is dropping out of OD for a split second and then going back in. If I drive in 3rd, I don't think it is happening. Isn't there a relay or solenoid that controls this function?
I have an '05 Suburban with starting issues. When it's cold out (below 40 degrees) and you turn the key, all accessories come on but truck will not crank. It then seems like the power just cuts off.......dash lights go out but gauges are fixed in place and a couple of seconds later, I hear a strange buzzing noise from the dash area behind the radio and the gauges will then go to power off position. Then if I try to start it, there is nothing, no lights on dash, no starter engaging, no clicking of the relays, nothing. I tried, on a hunch to disconnect the ground lead from the battery. Had it off for 10 minutes or so, put the cable back on, tightened it down (wasn't loose to begin with) and it started right up first try in 20 degree weather. I had previously had the battery and alt checked and both were good.
View 3 Replies2007 Chevy Suburban, 65K milesLet me start by saying I took this into to the dealer and they found nothing!
When I accelerate, I get a "flutter" in the engine. The best description of this flutter is that the RPMs go down about 200 or 300. I think it feels like it is sluggish when it accelerates. It is most obvious during the 35 - 60 MPH range, but you also see it when cruising at 70 MPH.
I tried adding some fuel treatment and ran some 93 octane through it to see if it was the fuel injectors, with no change in the behavior. No error messages or engine light is on. Regular oil changes and services (60K service, every 3K miles for oil change). Driving behavior has changed since I bought a Prius 3 months ago. It used to be driven 40 miles / day (+ long trips) and now is driven about 40 miles / week (+ long trips).
1995 Chevy Suburban, currently at 150,000 miles, Prior owner had transmission rebuilt prior to 100,000 miles. While towing my 18ft camper trailer on a recent trip every time I started off from a stop I had to really push on the gas to get going. At first I though the emergency brake was on, or I had a flat tire. I then noticed the automatic transmission was not shifting when I had it in D. Checked the transmission fluid and it was full. The transmission seems to be stuck in 3rd gear. When I move the shifter to 2 it will shift down. Reverse is also still working. Am I in for a costly repair?
View 3 RepliesI have random power drop off (best description is a loss then a surge or something like a skip) when driving over 60 mph. If I let off the gas or floor it the problem goes away temporarily. No mechanic has been able to figure it out. Chevy dealer just says "we don't have any codes".
View 10 Replies2002, Chevy, Suburban 1500, 4wd, 5.3L engine, 210,000 miles. Mass airflow sensor and both O2 sensors replaced last year in an effort to fix this problem. Original problem surfaced when the vehicle was shut down or running uphill and had about 1/2 tank of gas in hot weather. If stopped, the vehicle would not start until it had cooled down. Sometimes getting it onto level ground would be enough to get it running again. ( This accomplished by turning on the key and allowing the vehicle to roll back out of the parking place. ) If running down the road, getting to level ground after the stall, pulling to the shoulder and cooling the engine/waiting a few minutes and restarting the vehicle would work. This was before the above mentioned repairs.
Last weekend in 60 degree weather I was driving back from northern Michigan and as I headed up hill at 75 mph with the tank at 1/2 the vehicle did a high speed stall on me. Symptoms were: RPM showed 2000, but pushing down on the gas actually dropped the RPM no matter how feather-footed I was. This was tried several times. I turned on the 4 ways and moved toward the shoulder and at 50 mph finally got the thing to restart. The rest of the trip home was uneventful.
I had a 2001 Suburban with the same specs which did this same thing until a factory recall that got me a new fuel pump. I asked about the recall the last time my truck was in for service and they said it does not fall within the serial numbers for that recall. Fuel filter replaced about 9 months ago. Co-incidentally but not necessarily related is that my battery with less than 3 years of a 7 year warranty was draining itself in less than 2 days this last winter.
I have a 2004 suburban with approximately 125k miles on it, it is nominally my wife's car.
Recently it seems to not be able to access the last 1/4 tank of fuel. A couple of weeks ago my wife (who likes to run it down to the dregs) got it sub 1/4 tank, and it cranked but didn't start...put in 2 gallons from a can, started right up...took it to a gas station, filled it up (less the approximate 1/4 tank of fuel).
So, fuel pump? Pickup clogged? If so, what does it take to replace/repair...
I have a 03 Suburban LT with the 150,000 miles. and it misses out at 50mph or higher. I thought it was the transmission, and the tranny guy confirmed a new transmission was needed, but said he thought the missing was maybe the coils. the local Chevy dealer did the diagnostic, and determined the coils, plugs, and plug wires were all good. I 've replaced the oxygen sensor as well. The service manager said to keep driving it until the Check Engine light comes on. That concerns me, but hey what do I know. The mileage hasn't dropped off, and it runs fine the rest of the time.
View 5 Replies86 Diesel Suburban
Lately the voltage gauge sometimes starts to wander upwards toward the 18v red zone. When it does it wanders up and down a lot, but mostly well above the center 13v. Sometimes I left of the throttle a little and it goes back and stays at normal, and sometimes it doesn't and bounces up again as soon as I press the throttle. Doesn't happen on every drive, just sometimes.
I thought it unlikely this was a bad voltage regulator, since it's a pretty new alternator, 2 years tops. So I thought I'd see what other possible causes could be. (Why do they make the voltage regulator internal to the alternator now anyways, since they seem to go bad more often than the core? Can I just add an external regulator like the older trucks had?)
I've heard over-voltage can ironically sometimes be caused by a short, since the regulator dumps more voltage into the field coils because the main coils are showing they aren't delivering enough current (because it's all being soaked up by the short), resulting in an overall over voltage as the alternator tries to compensate for the voltage drop of the short.
How do I tell if this is the cause of the overvoltage or if it's something else instead? If it is a short, where could it be? I'm assuming it must be somewhere weird, because almost any normal place I could think of for a short would simply blow a fuse. Or is there such a thing as a partial short-- high enough resistance to not blow a fuse, but low enough to drive the alternator nuts?
Could it be related to overheating? I initially thought that was a possibility, because it began around the time the weather turned warm here, but on any given day it seems pretty random and not tied strongly to excessive speed or going up hills.
2002 1500 4WD 126K miles. A/C not working, compressor does not engage when A/C is switched on. Is there an interlock if the refrigerant level is too low to keep the compressor from engaging? Original owner, A/C has never been recharged. Is recharging my best first step.
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