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MobilOne · 04-17-2016, 02:41 PM

10w40 should be plenty heavy. Why not synthetic?

Replace all the vacuum lines. Not worth "checking". One does not fix a vacuum leak with a chip tune. Also, on that car, iirc, Ford had all the vacuum lines hooked to a little black plastic distribution connector attached to the firewall. I had one go bad. So you may want to check that. If, after you replace the vacuum hoses and you still have a vacuum leak, spray around the intake manifold connections with some carb cleaner. That should help you find the leak. BTW, how do you know that you have a vacuum leak? Misfire at idle could be several things. Get a vacuum gauge. VERY handy.

Why did the engine overheat? Radiator? Water pump? Coolant leak?

BTW, welcome to the site and good Ecomodding!

Hwy mileage, could be the torque converter is not locking up. Or a brake dragging.

How are you going to chip a 1988 car?

04-17-2016, 02:41 PM	#4 (permalink)
MobilOne Master EcoModder Join Date: Jan 2015 Location: Atlanta area Posts: 410 Thanks: 966 Thanked 74 Times in 63 Posts	10w40 should be plenty heavy. Why not synthetic? Replace all the vacuum lines. Not worth "checking". One does not fix a vacuum leak with a chip tune. Also, on that car, iirc, Ford had all the vacuum lines hooked to a little black plastic distribution connector attached to the firewall. I had one go bad. So you may want to check that. If, after you replace the vacuum hoses and you still have a vacuum leak, spray around the intake manifold connections with some carb cleaner. That should help you find the leak. BTW, how do you know that you have a vacuum leak? Misfire at idle could be several things. Get a vacuum gauge. VERY handy. Why did the engine overheat? Radiator? Water pump? Coolant leak? BTW, welcome to the site and good Ecomodding! Hwy mileage, could be the torque converter is not locking up. Or a brake dragging. How are you going to chip a 1988 car? Last edited by MobilOne; 04-17-2016 at 02:47 PM..