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95 Jeep GC sluggish crank
1995 Jeep Grand Cherokee Limited, I-6, close to 150K miles.
It cranks sluggishly. It actually starts ok because it's firing up on what may be the first rev but it's really slow sounding. Battery was about 30 months old. Spec. gravity thingy with the floating balls said cells were only at 75% charge. I checked system voltage with engine off and it was about 12 point something and with the engine running 13 point something to 14. Seemed better for awhile so I was been watching the vehicle's own voltmeter and it seems where it should be, near 14 with the engine running. I also removed and emery'd the posts and cable clamps. It started to seem sluggish turning over again in the last few days so today I checked the battery cells and this time 50% to 75%. Okay, time for a new battery so I got a pro-rated warranty replacement. After putting it in I was hoping to hear a vigorous start. But nope, still sluggish with the new battery. Of course the new battery, not coming from a place that keeps them on trickle charge, isn't really fully charged so I am hoping after it really gets charged it will in fact cure the sluggish crank but is there anything else I should be looking for? Do starters get "weak" or more likely just fail flat out? Also, is it normal to get oddly high battery voltage readings immediately after taking off charge, like in the 13's rather than 12 point something, maybe from "surface charge" or something? I'm not charging it at any great rate, just 3 or 4 amps....not much more than a trickle. SG doohicky said the cells were at 75%. --- OT but I'd gladly buy another new GC but I just can't see another 11 years of 15-18 mpg. I'm looking at maybe the Mariner Hybrid (if I can find one to test drive). Toyota Highlander was in the running til I saw that Consumer Reports said their tests had it only getting 22 mpg which makes it kind of pointless given the expense. Or I will give up and just get a car. |
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95 Jeep GC sluggish crank
Steve Kraus wrote:
> 1995 Jeep Grand Cherokee Limited, I-6, close to 150K miles. > > It cranks sluggishly. It actually starts ok because it's firing up on > what may be the first rev but it's really slow sounding. Battery was > about 30 months old. Spec. gravity thingy with the floating balls said > cells were only at 75% charge. I checked system voltage with engine off > and it was about 12 point something and with the engine running 13 point > something to 14. Seemed better for awhile so I was been watching the > vehicle's own voltmeter and it seems where it should be, near 14 with the > engine running. I also removed and emery'd the posts and cable clamps. > > It started to seem sluggish turning over again in the last few days so > today I checked the battery cells and this time 50% to 75%. Okay, time > for a new battery so I got a pro-rated warranty replacement. After > putting it in I was hoping to hear a vigorous start. But nope, still > sluggish with the new battery. Of course the new battery, not coming > from a place that keeps them on trickle charge, isn't really fully > charged so I am hoping after it really gets charged it will in fact cure > the sluggish crank but is there anything else I should be looking for? > Do starters get "weak" or more likely just fail flat out? > > Also, is it normal to get oddly high battery voltage readings immediately > after taking off charge, like in the 13's rather than 12 point something, > maybe from "surface charge" or something? I'm not charging it at any > great rate, just 3 or 4 amps....not much more than a trickle. SG > doohicky said the cells were at 75%. Comments: 3-4 amps should be enough to charge it, but you need to make sure you leave it on long enough - at least overnight. If it's still showing 75%, I'd suspect your hygrometer is not accurate. So you don't keep chasing your tail with that, I'd take it to the place you bought your battery and ask if they'd measure the battery with their hygrometer and put that question to rest. The surface charge thing is correct - voltage would start out higher right after a charge and drop down after sitting. 13.5-14 is about right with the engine running (charging it). Once you eliminate the confusion factor of whether the battery is up to snuff or not, if it's still slow cranking, then pursue that. On whether starters can get weak rather than fail flat out, someone else could better answer that. As billy ray suggested, you need to confirm integrity of all connections in the high current path to the starter, including grounds. Maybe the solenoid contacts are hight resistance, but I think they usually just get intermittent (one time it will crank right up, next time it just clicks) rather than constant sluggishness. Bill Putney (To reply by e-mail, replace the last letter of the alphabet in my address with the letter 'x') |
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