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#1943 of 3676 Chevy Blazer has electrical gremlin!
Mar 06, 2006 (8:13 pm)
I have a 1990 chevy blazer that is having (has been having...) some really bizarre electrical problems. It started with what i thought was a bad install of an aftermarket alarm system that was making the radio be on constant scan in FM mode and the cigarette lighter was making the dome lite go on... I disconnected the box to the alarm, re wired the stereo and those went away.
Then, I noticed the oil pressure gauge was bouncing up and down as if it had a loose wire... i found none. The interesting part was that when it was showing good pressure, the truck ran fine. When the gauge dropped to almost zero, the truck started to run horribly. I knew that the oil pressure itself was not really low because of the way the gauge bounced back and forth like it wasn't connected well... but why would the truck think it was supposed to run bad just cuz the gauge said so? Even more bizarre... if the gas tank is running close to empty, and the oil pressure gauge drops low again, the truck will start to stall at idle and the "check gauges" light will come on. Anyone know what might cause this?
I now have an even greater problem,unfortunately, because now the truck just won't even turn over. Started with it not reacting to turning the key in the ignition and had the starter tested. Was told it was bad and put in a new one. I worked for all of about a minute! Took it back to Autozone and they said I had gotten a faulty one. Got yet another one which worked for about 2 days! The other problem with the check gauges light and the oil pressure gauge continued. Two days later the original problem with the key turning and having nothing happen had returned intermittently. Usually it only took 3 or 4 tries and it worked again... as if the battery had been re connected! a few days later and the truck stalled again from the low oil pressure right in the middle of the street and has not started again since. I'm stuck! I was told the computer needed to be replaced but I don't know if that is really it... Does the computer have something to do with ALL of the weirdness going on with my truck? Please... somebody tell me they've seen this before and know what i need to do! Thanks!
#1944 of 3676 Re: 98 jimmy gas guzzler [newfy]
Mar 07, 2006 (5:42 am)
I have that Haynes too and for 98up it is pretty poor but the next one is Helm at $100 so...
No, the MAF is not the same as the IAT but in the intake next to it. It is right next to the air filter housing and is the round metal 2-3" thick piece with an electrical connector plugged in - remove the hose clamp from the intake box and you will see the MAF mounting in the middle of the metal in a honeycomb structure. Clean it with electrical contact cleaner or brake cleaner to fix poor performance - it feeds air flow data to the computer and if dirty can lean out the fuel.
#1945 of 3676 Re: 2000 Jimmy wont start [repairdog]
Mar 07, 2006 (5:53 am)
I got it fixed, it was the fuel pump. Does anyone know if there is a forum here to sell parts on? I had just put a sending unit into my 2000 Jimmy about 4 months ago, and figured id take it off the old pump and see if anyone needs one for a fraction of the cost of a new one.
#1946 of 3676 Re: 1985 Chev S10 Randomly Looses Power! NEED HELP [demex]
Mar 07, 2006 (10:48 am)
This goes way back but that 2.8 was known for having vapor lock. Have you checked the fuel pressure at the carb also? Line from the tank up and no leaks/air sucking in instead of fuel? There are several sensors feeding the ignition module also but sorry I only have the 4.3 motors.
Lots of info out there on it.
#1947 of 3676 Re: Chevy Blazer has electrical gremlin! [jessejamez]
Mar 07, 2006 (11:21 am)
Check the ignition switch assembly (key/tumbler)cause everything feeds thru it. Battery terminals all clean, the positive cable to the starter good, the negitive cable good, and make sure the grounds are all good. After that I would look at the ignition module in the distributor - easy to replace and can cause stalling but that doesn't explain the starter issue.
#1948 of 3676 Re: 98 jimmy gas guzzler [repairdog]
Mar 07, 2006 (12:23 pm)
hey,repairdog, i finally found a picture of the maf in Chiltons bok no. 28624 for gm full size trucks 88 to 98 but this book is also published by haynes. so,i suppose i have to take the hoses off and spray the 3 wires inside which look like heating elements? there are also window like openings on the outside,should they be sprayed too?
by the way,i'm chatting from St.John's. newfoundland and labrador,Canada.
#1949 of 3676 Re: 2000 Jimmy wont start [fixit5561]
Mar 07, 2006 (1:15 pm)
Does anyone know if there is a forum here to sell parts on?
No, we are not set up for buying and selling in the forums.
Drive on over to my place!
#1950 of 3676 heater problem in Olds Bravada
Mar 07, 2006 (1:30 pm)
The Olds Bravada is mostly identical to Chevy Blazer so I wonder if anyone can help with a heater problem in my 2000 Bravada. I love the car but this problem is getting me ready to sell it. The heater is designed so I set a temperature and it tries to maintain that temperature, but it either blasts hot or cold. I would much rather an old fashioned system where I just have slider to adjust the temperature that comes out of the vents. Does anyone know a solution?
#1951 of 3676 Re: 98 jimmy gas guzzler [newfy]
Mar 07, 2006 (4:25 pm)
Actual sensor is in the middle of that honeycomb so spray that and good to go. Keep warm, I'm in Florida!
#1952 of 3676 Re: heater problem in Olds Bravada [winoneonta]
Mar 07, 2006 (4:37 pm)
I have the same in the LT Blazer and if its climate control with the marked temps on it you can overcome it by setting the fan to the speed you want, the temp to any setting you want, select where you want the air to go, but never use the AUTO positions on the right or left controls cause they will constantly change and drive you crazy! To shut off the outside air flow select recirc (in cab pic) on lower left or select outside pic for fresh air. If you want cooler than outside turn the AC on. That works. The system uses an electric blend motor on the AC/Heater box to maintain the auto temp and if that fails about $700 to replace and the system constantly switches hot to cold searching - all Chevy dealers can easily find and fit this - bring $$ - try above first hopefully cures it.