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Old 11-17-2011, 07:41 PM   #1
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Car "stumbles"


Hi People, again,

Well, another of my cars, an 80's sunbird, TBI, has many new parts, and I DO keep it up. But, Ive ben living with this for say, 7-8 years now- You start the car , reverse slowly to back out of garage by letting out clutch normally, then, as the car reaches the point where you push in the clutch and prepare to brake (before puting into 1st to take off), the engine almost dies!

Its like, one would expect the engine to even rev up especially since the clutch has been disengaged, and less load on engine, but , noooooo, it gets even worse by almost stalling!

Happens worse when cold. It behoves me as to why the engine gets stalling when one would depress clutch and lessen load on engine. Vacuum leak? I checked for that sooo many times. new AIC valve, new TPS, Oh well, just taking a chance here. Tips/feedback always appreciated.

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Old 11-17-2011, 11:43 PM   #2
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Car "stumbles"


You said 80's so im guessing you have a carb if so it sounds like a normal engine warming up. Does this only happen after car has sat overnight or a long period of time?

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Old 11-18-2011, 08:38 AM   #3
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Car "stumbles"


Actually, 88, and I mentioned TBI. I dont remember car doing this when new. Thanks!
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Old 11-18-2011, 09:40 AM   #4
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Car "stumbles"


Does it have an IAC (Idle Air Control) valve? It could be stuck or broken not allowing air to bypass the throttle plate. Reason it stays running when in gear is because of the vacuum while in gear.
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Old 11-18-2011, 03:41 PM   #5
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Does it have an IAC (Idle Air Control) valve? It could be stuck or broken not allowing air to bypass the throttle plate. Reason it stays running when in gear is because of the vacuum while in gear.
Yes, has an AIC.....NEW. And the old one wasnt even broke! It was a gamble, you know, before I knew how to test them.

I still have a hunch its vac related, just havnt ben able to identify it yet. Its hard!!
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Old 11-18-2011, 04:18 PM   #6
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Car "stumbles"


Quote:
Originally Posted by noquacks
Actually, 88, and I mentioned TBI. I dont remember car doing this when new. Thanks!
Oh ok i missed that try cleaning and re gapping your plugs
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Old 11-18-2011, 05:40 PM   #7
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Car "stumbles"


With that setup I would also suspect vacuum lines. what us the condition of the pcv valve?
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Old 11-19-2011, 09:18 AM   #8
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Car "stumbles"


well, thanks guys, but new/gapped plugs periodically (recently, a few mionths ago, after which, no change), and pcv valve tested OK, but you know, heck- I have a new one sitting around, maybe I'll put it on (duhhhhhhh)
(still, I strongly am pessimistic, too easy)

I will advise on this asap!
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Old 11-19-2011, 09:20 AM   #9
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Car "stumbles"


Oh, I should say, the EGR valve has been yanked years ago- car ran way worse with it than with the EGR tube removed and stoppered with wood dowel.....LOL
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Old 11-24-2011, 10:24 PM   #10
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so when you pulled the EGR, you plugged the vacuum line (if it isn't an electrical EGR) and the passages for the EGR yes?
Also what engine are you running?
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Old 11-25-2011, 09:19 AM   #11
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so when you pulled the EGR, you plugged the vacuum line (if it isn't an electrical EGR) and the passages for the EGR yes?
Also what engine are you running?
Right, Erin, I plugged the line. Now, coincidentallly, this morning, I popped in my new PCV, and car runns better, does not stumble nearly as bad. Im happy for now. Thats to the above member who suggested that!

BTW, why does my car run worse with the EGR connected?
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Old 11-25-2011, 01:23 PM   #12
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Car "stumbles"


It's probably because the EGR valve was partially open. It is only suppose to open at certain conditions. But, if it sticks open (they do get clogged), it will feed back exhaust gas all the time. It will cause the car to stumble and sometime die.
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Old 11-25-2011, 03:24 PM   #13
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Car "stumbles"


thanks, makes sense, but egr was new when I installe dit. Its a mystery to me. I know about the diaphragm in that valve, btw. Its closed/tight. And, theyre so expensive too!
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Old 11-25-2011, 03:30 PM   #14
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Car "stumbles"


Next time, pull the vacuum from the EGR solenoid and plug it, then see if it makes a difference. A leaky solenoid will do the same thing.
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Old 11-26-2011, 12:08 AM   #15
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is there any chance that at some point in repairs, vacuum hoses could have been swapped? I once did that on a ford I used to own cause there were 3 vacuum lines real close and easy to swap by mistake. Check the vacuum diagram if there is one, of course on my stupid car I didn't have nor could find one on the web and had to look at a junkyard car and make my own.

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