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nemesis54
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Vehicle: 89 BMW 325 is ,64 Falcon
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From: Anacortes state of mass confussion
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lounge lizard
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 Posted
- September 16 2008 : 9:23p
| sounds like fuel regulator is acting up.
and get your alt. checked out. | |
nemesis54
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Posted
- September 17 2008 : 11:33a
| checked and replaced the regulator twice.....still does the same thing.I did bolt on the top half of a TBI throttle body from a 4.3 just to see if any thing changed and the engine ran better for a few minutes and then went back to the same goofy loping action.So I took that set-up off and replaced the original TBI top and still no change.I did get a trouble code durring that swap that said my throttle position sensor was to low in voltage so I installed a new one.After that the truck ran awesome for a couple of hours and then went back to it's same old loping routine?
I'm getting pretty close to trashing the whole fuel injection system and running the trusty old Edelbrock 4bbl and manifold if this keeps up!! | |
Buzz
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From: Garland TX
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Posted
- September 17 2008 : 1:34p
| | Sounds like a vacuum leak somewhere for the loping issue.... | |
Tom in Tacoma
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Posted
- September 17 2008 : 3:32p
| From what I remember about GM products - if there's a vacuum leak it would cause a shake at idle all the time. It would also bog down when leaving from a stop unless you opened the throttle more. But now that I've said that - what you're describing sounds a lot like it's getting loaded up with too much fuel.
Regarding the noise when you've got an elecrical load - my money'd be on the alternator going bye-bye before long. Wouldn't be the first time I've heard a tell-tale whistle from one.
Good luck! | |
nemesis54
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Posted
- September 17 2008 : 4:33p
| Thanks Tom.....the alternator parted with us this morning on the way to shop.....I'm sure it is a better place now .I guess it's time for the big up-grade alternator . | |
Tom in Tacoma
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Posted
- September 17 2008 : 5:25p
| Pretty smart cookie - aren't I?
Whenever something breaks or needs replacing, it's always time to upgrade/improve upon it!
Is it still loping? | |
nemesis54
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Posted
- September 17 2008 : 7:49p
| | Ya the thing bucks like pissed off horse.....feels like th tranny can't make up it's mind wether it wants go or stop?That only happens whem I slow down and the engine is off throttle and then I take off again.The loping happens when I come off any road that is 35 mph or faster.....you know like your coming to a red light and as you get closer the light turns green you give the truck a little go pedal and she starts to "wump,wump,wump,wump" until you hit the throttle a little harder and she takes off.I know small blocks like the back of hand,I've rebuilt I don't know how many , but they were all carburated engines and have had no troubles with them....this computer crap has got me stumped?I figured I would put our OBD scanner on her and figure it out but I'm getting no trouble codes? | |
Gentleman Jack
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From: Seattle Washington
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Posted
- September 17 2008 : 10:46p
| | I wonder if the torque converter clutch is locking up and unlocking. | |
Buzz
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From: Garland TX
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Posted
- September 18 2008 : 4:18a
| | I've had the same issue of the loping and rough idle on my truck....it was a vacuum leak......a rubber elbow coming off the intake for the PCV had a small crack in it so it was sucking air. Granted this was a Ford so I don't know if it applies to a Chevy but what do I know..... | |
97F1504RAD
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Posted
- September 18 2008 : 10:00a
| | Does this run on a MAP Sensor? If so that may be the culprit. Also the way your saying the tranny does not work i would also suspect the TPS | |
nemesis54
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Posted
- September 18 2008 : 2:09p
| | TPS as in "throttle position sensor" if thats what you are talking about ....yes I've already replaced it....I can't find any vacume leaks.It does have a MAP sensor but it checks out ok.....at least thats what my scanner is telling me.I'm not sure about the torque converter locking in and out.....I'll have to find out if the tranny in my truck is electronic?I know that we use these 700r4s in some of the street rods we build but they don't get wired to any power,just the shifter cable,TV cable and back-up and neutral safety harness. | |
Buzz
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Posted
- September 18 2008 : 3:01p
| | Hate to hear of your issues....make sure you post up what the problem was once you get it figured out. Good luck! |
Edited by - Buzz on September 18 2008 3:01p |
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SPROCKET
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From: California
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Posted
- September 18 2008 : 4:24p
| | With the engine running you can spray carb cleaner on the vacuum lines and if the idle goes up then you found the leak. | |
MrSVTGal
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Posted
- September 18 2008 : 4:30p
| A Ford with a bad MAF will do stuff like this. How does a Chevy 350/TBI setup measure the amount of air that goes into the system? My guess is that it does it with a MAP or BAP sensor, and that sensor may be reporting the wrong air pressure.
Also, if you've changed your cam or made big exhaust changes, you can mess up a MAP/BAP based FI system pretty good.
MrSVTGal | |
Mort
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Posted
- September 18 2008 : 11:11p
| A 700R4 would not be electronically controlled. A 4L60E would be the same thing with electronics.
That sounds like my old Nova when I had the carb float set too high. Have you read a plug? Or given it a tuneup lately? It sounds basic, but it seems like every time a vehicle of mine is running crappy, its always because I'm way over on a tuneup. | |
nemesis54
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Vehicle: 89 BMW 325 is ,64 Falcon
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From: Anacortes state of mass confussion
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Posted
- September 18 2008 : 11:18p
| | Nova? what the hell is a Nova?....Just kidding Mort....how the hell are ya?I'm gonna give it a full blown tune up this weekend.All the plugs checked out ok and the plug wires look pretty damn new....but I'm gonna start with a full tune up any way.It's gonna piss me off if it turns out to be somthin stupid. | |
97F1504RAD
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Posted
- September 19 2008 : 9:46a
| Since this runs with a MAP have you checked the port that it goes into for the proper vacuum?
Also check the distributor for play it could have a shaft that is worn out.
Also have you performed a fuel pressure check yet?
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Edited by - 97F1504RAD on September 19 2008 9:54a |
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Mort
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97F1504RAD
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Posted
- September 23 2008 : 7:54p
| | Well have you gotten this figured out yet??? | |
nemesis54
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Posted
- September 24 2008 : 7:57p
| ope I've way to busy with our house warming party we are having this weekend.Soon as the house in order I'll start messin with the truck again....with all the suggestions I think I'll be able to track it down......I hope | |
Mort
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nemesis54
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Vehicle: 89 BMW 325 is ,64 Falcon
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Member # 124
From: Anacortes state of mass confussion
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Posted
- October 1 2008 : 5:26p
| The results are in!!It was the cat .....thing had come apart and plugged itself up.I remember now that as I was driving every once and a while I would here what sounded like metal making that tin can sound when it gets hot.So I had the truck up on our hoist last night and was thumpin on the exhaust when I found that the cat sounded like something was rolling around in it.A big chunk had come apart and turned into a hardball sized clump......I'm guessing after banging around in there long enough that it destroyed all the honeycomb it could until it would just bounce up into the exit section and get stuck?This I'm guessing would plug up the exhaust and make the truck act wierd.All I know is my truck feels like it picked up about 50 horse power.....ya theres no more cat and she seems to run fine fine now!! | |
Tom in Tacoma
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Posted
- October 1 2008 : 5:45p
| Yep - that'll do it! I recall, while running a Firestone store, a Mazda that came in running like crap. The tech couldn't figure it out. We left it idling for a while to get it up to temperature until it started to bog down. After restarting it and keeping it revving we found the exhaust manifold starting to glow and showing cracks. We traced it down to a catalytic converter that was plugged up solid.
Glad you figured it out! | |
Buzz
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Posted
- October 1 2008 : 6:31p
| I should have thought of that.....this happened to my son-in-laws Dodge truck. Glad to hear your truck is running fine again.  | |
go gmc
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Posted
- November 2 2008 : 6:54p
| | it is possible its your throtle postion sensor they do get worn | |
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Can't figure this out??
