90rx7 with a rough idles/stalls when ac is on, help!
04-13-03, 11:28 PM
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90rx7 with a rough idles/stalls when ac is on, help!
Hey, I'm new here, I have been drooling over rx7's for a few years, and now I have one of my own, its a 1990 convertible. black interior/exterior
My problem is it idles really low and usually stalls when the ac is turned on, it also drops to a really low rpm after racing up to 7k rpm and releasing the throttle. Any ideas before I rip into it?
I think it's probably a vacuum hose or somethin, but I need a diagram before I touch it
My problem is it idles really low and usually stalls when the ac is turned on, it also drops to a really low rpm after racing up to 7k rpm and releasing the throttle. Any ideas before I rip into it?
I think it's probably a vacuum hose or somethin, but I need a diagram before I touch it
04-13-03, 11:35 PM
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TII 4 SALE!
Try cleanign out the BAC valve with some carb cleaner, I believe their is a really good write up at www.1300cc.com ...
09-26-03, 04:20 PM
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sorry for the ungodly amount of time it's taken me to reply. (my computer is broken)
Every once in a while it will pop/backfire when letting off after 8k rpms never happens in lower revs.
its got 100K miles on it. replaced spark plugs & wires recently b/c the original owner told me he never replaced them... ever
the idle is at the spec. range, I did raise it a tad just in case, yet I still end up with the same problem.
Every once in a while it will pop/backfire when letting off after 8k rpms never happens in lower revs.
its got 100K miles on it. replaced spark plugs & wires recently b/c the original owner told me he never replaced them... ever
the idle is at the spec. range, I did raise it a tad just in case, yet I still end up with the same problem.
09-26-03, 04:23 PM
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wierd, mine is just the opposite. Mine ruff idles unless the A/C is on. And mine pops/backfires at high RPM too.
Should i do the BAC thing too?
oh ya and car doesn't stall.
Should i do the BAC thing too?
oh ya and car doesn't stall.
Last edited by DoingAnything; 09-26-03 at 04:25 PM.
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09-26-03, 07:26 PM
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Originally posted by DoingAnything
wierd, mine is just the opposite. Mine ruff idles unless the A/C is on. And mine pops/backfires at high RPM too.
Should i do the BAC thing too?
oh ya and car doesn't stall.
wierd, mine is just the opposite. Mine ruff idles unless the A/C is on. And mine pops/backfires at high RPM too.
Should i do the BAC thing too?
oh ya and car doesn't stall.
Ya mine does the same thing! I haven't had a chance to clean out my BAC yet but I'm hopping thats all thats wrong.
09-29-03, 11:52 PM
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alrighty... ripped off the bac valve, got some carbuerator cleaner, cleaned it out (wasn't very dirty in the first place) till it was shiny. Same problem with idle, but at least it doesn't die when I put the AC on, but it's almost winter, and I don't need it anymore!
Idle bounces between 650-900 with no acc. on. Almost dies when releasing throttle, usually the needly drops to the bottom of the gauge.
this isn't exactly a problem, just more of an annoyance, since it rarely dies, and tapping the throttle usually brings the engine back up to speed
Idle bounces between 650-900 with no acc. on. Almost dies when releasing throttle, usually the needly drops to the bottom of the gauge.
this isn't exactly a problem, just more of an annoyance, since it rarely dies, and tapping the throttle usually brings the engine back up to speed
09-30-03, 12:02 PM
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Same problem. 90 vert w/ auto trans. Have cleaned BAC. Installed a different BAC. Checked TPS. replaced Vacuum lines. Complete tune up. Idle is just unstable. Idles within spec in drive, high in park also surges at about 1400 RPM. Problem seems to be that the idle doesn't increase when you apply the brakes or when you turn on the air. Have also checked the signal from the ECU to the BAC and the voltage increases some when the accessories are turned on but I don't know how much the volts should increase. Ideas appreciated.
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