raksj04

iTrader: (1)

so this morning my car had a little more trouble starting that normal. normally it takes about 2 or 3 secs for it to fire up. this morning it took too turns of the key. held it for about 5 secs, then tried again pumping the gas started after about 3-4 sec. now is this because i started my car the night before moved it about 20 feet, reved it a little. then turned it off, not while reving the engine. any thoughts. and i was wondering about how to do a compression test. and what compression is in spec. i only have done compression tests on small lawn mower type engines.

Go48

iTrader: (7)

Did it eventually start? If not, you will have to do a de-flooding procedure. Lots of information on this forum about how to do that so do a search. Same comment for how to do a compression test--search.

Shutting down a cold rotary engine is not a good idea and can, indeed, result in "flooding". Pumping the gas pedal does nothing in a fuel-injected engine. If you have an S5, pressing the pedal to the floor will cut off the fuel supply and help in clearing a flood.

My5ABaby

iTrader: (7)

Well good thing you own a rotary then .

From http://www.rotaryresurrection.com/ .

Poor Man’s Compression test(free):
1. remove lower sparkplug and wire from front rotor.
2. remove EGI fuse from underhood fusebox to prevent fuel and spark while testing.
3. have an assistant crank the car over for you, while you listen under the hood at the compression pulses coming from this plug hole. IT is recommended to put your hand/finger right in front of the hole to feel the pulses of air.
4. There should be one strong pulse/whoosh of air per full rotation of the crank pulley. Use the timing marks on it as a reference. There should be 3 even pulses in succession, without skips or gallops.
5. IF one or more pulses are weaker or non existant, this indicates (usually) at least one blown apex seal and severe internal damage. A full rebuild will be required, and no further troubleshooting will help.
6. IF this chamber passes the compression test, replace this plug and repeat for the rear. The rear rotor blows more often then the front on 88 and prior engines, and the front rotor blows more often on 89 and later engines, for reasons unknown.
7. With both lower plugs out at one time, you can listen/feel for compression on both rotors at once. This should be a rhythmic ch-ch-ch-ch-ch-ch sound, like an old steam engine train, alternating front to back, once per rotor per rotation. Any skips or galloping indicate loss of compression.
8. note that this procedure can be used to test junkyard engines or engines out of the car. You will need a 19mm socket and ratchet to turn the front crank pulley bolt clockwise in quick, long strokes as possible to get a somewhat accurate reading. You will obviously not be able to turn the engine much at a time, so try to count each pulse as you go.

Compression test using a piston engine tester:
1. note battery strength. A weak battery will yield low compression results.
2. Remove both lower plugs and wires.
3. remove EGI fuse from engine fusebox.
4. have a friend floor the accelerator pedal, opening the throttle for more airflow
5. insert your tester into the leading hole
6. hold the valve on the side of the tester open
7. have your friend crank the car over for 5+ seconds.
8. observe the needle bounces. You should see 3 in succession without skips, even bounces, in roughly the 30-35psi range.
9. let out on the valve now, and let the tester reach an overall compression value for all 3 faces(highest of 3 will be displayed). 115+ is like new, 100-115 is healthy, 90-100 is getting weak(1 year or less in most cases) below 90 could blow at any moment.
10. repeat for opposite rotor. Note difference in overall compression between rotors, which should be no more than 20psi max.

raksj04

iTrader: (1)

thanks for the help. now the car did start, and pumping the gas is because i am use to my carbed truck, and with some EFI cars pumping the gas three times puts it in to flooded mode.