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BEatonNo1
Nobel Prize Winner
USA
1133 Posts |
 Posted - Feb 13 2004 : 1:35:01 PM
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I have a friend who recently bought a 1985 RX7 and when he gives it the gas it doesnt respond. he replaced the fuel filter, but it didnt improve the situation.
Im wondering if this could be from a lack of compression? neither of us know very much about RX7s
Also He said that when the previous owner was driving it he would redline it before shifting, is this normal practice on an RX7?
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BEatonNo1
Nobel Prize Winner
USA
1133 Posts |
Posted - Feb 13 2004 : 5:27:55 PM
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well I got a chance to go out there and see it, and drive it. when you put it into gear it starts dying like you let the clutch out wrong, but as you give it more gas it still dies. then right as you think its fixing to die on you it starts running semi normal. one big thing i noticed is that afterwords we had it idling and it would run in short bursts. like the computer was only giving it gas in little spurts at an evenly spaced interval.
At this point I think it could be his throttle sensor or something along that line.
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Feb 16 2004 : 11:42:30 AM
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OK, there are two kinds of '85 RX-7s. If it is a GSL-SE, then it is a fuel injected 13B. If it is a regular GS or GSL, then it is a carbureted 12A. Obviously, each engine will have a vastly different cause for this problem...Let me know which, and I can help.
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BEatonNo1
Nobel Prize Winner
USA
1133 Posts |
Posted - Feb 16 2004 : 3:08:59 PM
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well I'll have to check with him, but Im pretty shure its fuel injected
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n/a
DELETED (Inactive)
2 Posts |
Posted - Feb 16 2004 : 7:55:14 PM
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aye, that would be my Rx7 Gsl Se, sorry for not putting enough info
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Feb 17 2004 : 09:26:48 AM
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Nice purchase. The GSL-SE is in high demand by RX-7 enthusiasts due to the fact that it has the largest engine of any of the 1st gens, and the general rarity of finding one....Me, I'm more of an early 1st gen person...Nothing like driving a '78 or '79 with the 12A, Nikki carb, and strange thermal reactor emissions system...Anyway....
You're looking at the classic symptom of a vacuum leak. Air is entering the engine after the AFM (air flow meter, under the airbox). VERY common problem. The solution is to look for any obvious cracks in the intake duct, as well as replace ALL the vacuum hoses. A water gun helps with this. Start the car, and spray water around the engine. You will find the vacuum leak when the engine sucks in the water and runs differently...
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n/a
DELETED (Inactive)
2 Posts |
Posted - Feb 17 2004 : 6:04:14 PM
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aye thank ye, like Beaton said, I don't know to much bout Rx7's but the solution isn't that hard to do is it?
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Feb 18 2004 : 09:02:47 AM
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I posted the solution above. Generally, replacing the vacuum lines involves removing the upper intake. I don't think it's particularily difficult, but then I've done so many that it takes under 5 minutes to have the top of the engine almost completely stripped...
If you can find it, the Haynes repair manual for the 1st gen is a great book.
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RX-7 problems
