Question about 1989 Chevrolet Suburban

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1989 Chevrolet Suburban Problem

I can not keep my suburban running , it will not start at all with the vaccum hose hooked up to the map sensor, but you take it off it runs ok for just a bit, but not enough to drive,

thank you for your help

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  • kankles70 Dec 21, 2008

    I have the same problem with my 89 suburban it will run fine when the MAP is disconnected from the vacuum line allowing for a major vacuum leak, but when plugged back into the MAP sensor the engine RPM would tidal from normal idle speed to almost dying out. I tried replacing the MAP sensor ($60) with no difference noted. A friend has suggested the fuel pump, but I already tested the fuel pressure to be at 10 lbs which is within specs. I was wondering if you had found out what the issue was on your suburban before I start spending money replacing more stuff. I already checked for codes, which there weren't any... My only other thoughts are possibly TPS or??? Thanks



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I've Been reading up on this problem and working on an 89 suburban with the same problem, tps, vacuum leaks, fuel pump, fuel filter, IAC, EGR, MAP Sensors are not the problem

Posted on Nov 22, 2009


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