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Unread 08-21-2007, 05:57 PM   #1
Deadbolt
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1997 Grand Cherokee

My son has a 97 GC Orvis 5.2L V8. It frequently hesitates for a second or two when accelerating from a dead stop - like it's choking. I doesn't do this all the time, just occasionally, and it seems to happen more often when the gas level is at 1/4 tank or less. It does not create any computer codes. We've changed the fuel filter, had the injectors cleaned, gas tank removed and cleaned, replaced the fuel pump, and checked the fuel pressure. Our mechanic now believes the fan clutch may be the cause, wherein the gas is getting too hot and not flowing smoothly through the injectors when you accelerate. I've also been told by someone else to check the TPS (throttle position sensor). So far, this has all been guesswork. If anyone has any specific ideas that would help narrow down the cause, I'd sure appreciate it.

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Unread 08-21-2007, 06:36 PM   #2
Reswob
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Do you only notice this when turning from a stop, or all the time?
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Unread 08-21-2007, 07:58 PM   #3
Deadbolt
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He says it's mostly when making a turn from a stop, but sometimes also when going straight ahead.
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Unread 08-21-2007, 08:23 PM   #4
Country Jeep
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I recommend that you don't go any farther without replacing the TPS; it sounds like that's the problem. It's not that expensive ($40), and can be installed in 5 minutes. It isn't worthwhile to go through the whole voltage-checking process to see if it's bad, I would recommend that you just go ahead and replace it. They usually go bad every year or so (at least, in my case), and can cause all sorts of acceleration- and shift-related problems.
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Unread 08-21-2007, 08:55 PM   #5
Deadbolt
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You're the second person that has suggested the TPS, so that's what we'll do. I appreciate your input. Do you have any thoughts about the mechanic's suspicion involving the fan clutch?
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Unread 08-22-2007, 10:09 PM   #6
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Quote:
Originally Posted by Deadbolt
You're the second person that has suggested the TPS, so that's what we'll do. I appreciate your input. Do you have any thoughts about the mechanic's suspicion involving the fan clutch?
Very far-fetched. If the fan clutch was bad, either the motor temperature would rise to dangerous levels because the clutch is not engaging when hot, or the motor would never warm up because the clutch is stuck engaged.

What is the average engine temp. when driving and stopped? Have him read the temperature gauge after it's warmed up, and has been sitting for at least 5 minutes idling.

Another note, if the clutch was stuck engaged, the fan would be extremely loud when revving up the motor. Some people complain about the fan being loud when taking off from a stand-still when the motor is still cool. This is normal, but if the fan seems loud all the time, every time the motor is above 750rpms, that could be an indication that the clutch is stuck.

Again, I highly doubt that that's the problem, or that such a problem would effect the fuel system, but it is still something to look into. You never know...
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Unread 08-22-2007, 10:24 PM   #7
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Quote:
Originally Posted by Deadbolt
You're the second person that has suggested the TPS, so that's what we'll do. I appreciate your input. Do you have any thoughts about the mechanic's suspicion involving the fan clutch?
Go to a different mechanic I've seen stranger things happen but the fan clutch was on the last of the list, wait actually it wasn't on the list at all for this one.

X3 for a TPS and see if it cures it.
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Unread 08-23-2007, 11:39 AM   #8
Deadbolt
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I appreciate the response. Looks like the majority think the TPS is the likely cause, so that's what we'll do. I wasn't really convinced about the fan clutch anyway. Just didn't seem logical to me. But, if the TPS doesn't solve the problem, then I guess we'll try it. Thanks to everyone who responded to my question.
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Unread 08-23-2007, 01:06 PM   #9
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yeah and has he changed his spark plugs ? If they're original i'd change those too -- mine ran better after that - it kinda hesitated a lil before i had them changed -
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