VACUUM
Simple test: attach a mityvac directly to the modulator: it's a round plug attached to the driver side of the transmission that has a vacuum(plastic line) going to the engine.

Then pull vacumm between 5-7 in. (you need a long vacuum line so you can hold on to the mityvac while inside the car- autozone has them for 10ft for $4)..

While pulling vacumm at the modulator, start the car and go thru all the shift issues you were having and see if it dissapears. If it does, Modulator is working .YOU HAVE A VACUUM LEAK! If for some reason, you can't sustain vacuum at the modulator, that means the modulator is leaking..if you have to pump it every 30sec-1 min to sustain 5 inches, you should be ok. The mityvac is the best $30 dollar investmant you'll ever make. Keep us informed

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a2


1978 280 CE silver
1986 560 SL black
1987 300 SDL cream
1994 SL 500 brilliant green
1997 E 300d dessert silver
2005 FORD F250 Superduty Crew cab 4x4

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