Engine Sputters
03-15-12, 11:24 AM
#1
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Engine Sputters
I just got an 86 GS with 59,047 miles and has 100% original engine/powertrain. It is constantly sputtering and accelerates/decelerates (revs up/ revs down) when idle ... It accelerates strong with rarely a missfire when driving until I idle.
I replaced the Mass Air-Flow sensor, Air filter, Spark Plugs, Spark Plug Wires, Battery, Installed a Voltage Stabilizer with new grounds, replaced BAC and Temperature Air Sensor, replaced Fuel filter with fuel pump, the coolant reservoir and Sub-Zero reservoir are full, had a professional fuel system flush. I'm STUMP!!!
I replaced the Mass Air-Flow sensor, Air filter, Spark Plugs, Spark Plug Wires, Battery, Installed a Voltage Stabilizer with new grounds, replaced BAC and Temperature Air Sensor, replaced Fuel filter with fuel pump, the coolant reservoir and Sub-Zero reservoir are full, had a professional fuel system flush. I'm STUMP!!!
04-02-12, 04:47 PM
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Well, I replaced the TPS and I'm still having the same proplem... I guess the only thing left to replace or check is the Throttlebody and Injectors.... I will most likely start with the throttlebody. Let me know what you guys think!
04-02-12, 05:25 PM
#7
Well, you replaced the TPS, but did you adjusted/calibrated it? If you just put a new TPS and don't calibrate it, I don't think it will work properly...
Last edited by Eduardo Santos; 04-02-12 at 05:35 PM.
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04-02-12, 06:20 PM
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Make sure your TPS is calibrated properly.
Check for vacuum leaks, just spray propane or carb cleaner on all your vac lines, and see if the idle changes, if it does you have a vac leak.
Spray propane/carb clean around intake gaskets, to check for more leaks.
Inspect the intake passage between the MAF and the Throttle body for holes or leaks.
Get some throttle body cleaner and a rag and clean out the throttle body, especially around the upper butterfly valves. If its all clean and shiny, then check the adjustment for the upper butterflies and check their clearances. (you want to concentrate on the top 2 valves because those are not monitored by the TPS. So if too much air is getting by them, you will get essentially a massive vacuum leak.
Check for vacuum leaks, just spray propane or carb cleaner on all your vac lines, and see if the idle changes, if it does you have a vac leak.
Spray propane/carb clean around intake gaskets, to check for more leaks.
Inspect the intake passage between the MAF and the Throttle body for holes or leaks.
Get some throttle body cleaner and a rag and clean out the throttle body, especially around the upper butterfly valves. If its all clean and shiny, then check the adjustment for the upper butterflies and check their clearances. (you want to concentrate on the top 2 valves because those are not monitored by the TPS. So if too much air is getting by them, you will get essentially a massive vacuum leak.
04-03-12, 05:36 AM
#9
Make sure your TPS is calibrated properly.
Check for vacuum leaks, just spray propane or carb cleaner on all your vac lines, and see if the idle changes, if it does you have a vac leak.
Spray propane/carb clean around intake gaskets, to check for more leaks.
Inspect the intake passage between the MAF and the Throttle body for holes or leaks.
Get some throttle body cleaner and a rag and clean out the throttle body, especially around the upper butterfly valves. If its all clean and shiny, then check the adjustment for the upper butterflies and check their clearances. (you want to concentrate on the top 2 valves because those are not monitored by the TPS. So if too much air is getting by them, you will get essentially a massive vacuum leak.
Check for vacuum leaks, just spray propane or carb cleaner on all your vac lines, and see if the idle changes, if it does you have a vac leak.
Spray propane/carb clean around intake gaskets, to check for more leaks.
Inspect the intake passage between the MAF and the Throttle body for holes or leaks.
Get some throttle body cleaner and a rag and clean out the throttle body, especially around the upper butterfly valves. If its all clean and shiny, then check the adjustment for the upper butterflies and check their clearances. (you want to concentrate on the top 2 valves because those are not monitored by the TPS. So if too much air is getting by them, you will get essentially a massive vacuum leak.
Just make sure the engine is not too hot when doing so, or it may caught on fire.
04-13-12, 11:17 PM
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try this www.aaroncake.net/rx-7/grounding.htm
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