engine bogging, or missing while driving

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Aug 27, 2005 | 12:09 AM

#16

MemOrex

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From: B/CS, Texas!!

There was a problem with the TFI Module on F150's up to 1990. After driving a while, the TFI would overheat and start malfunctioning. This could be the cause.

Aug 27, 2005 | 08:48 AM

#17

neoflee

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whats a tfi?

Aug 27, 2005 | 02:43 PM

#18

neoflee

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I replaced the tif, it was 12.99 at auto zone and still no change. going to try new plug wires in 30 min

Aug 28, 2005 | 12:44 PM

#19

mmacsek

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My 89 E450 with a 460 does the same thing. I'm also getting a code 33. The vacuum line on the EGR has vacuum but it pulses and not a steady vacuum. This problem is very frustrating. Matt

Aug 28, 2005 | 02:10 PM

#20

MemOrex

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From: B/CS, Texas!!

neoflee, try cleaning the IAC valve and your throttle body.

Aug 28, 2005 | 02:15 PM

#21

neoflee

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whats the iac?

Aug 29, 2005 | 11:57 AM

#22

neoflee

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Quote:

Originally Posted by MemOrex

Leave the EVP (gray thing) on the EGR valve. If you remove it, the EGR will never open.

Follow the vacuum line off the EGR valve. This vacuum lines connects to the EVR. The EVR also has another vacuum line connected to the intake. Once you find the EVR, you'll see it has an electrical plug connected on it. The plug has 2 wires on it.

Now, looking directly at the plug, splice into the left wire(PIN 33). Make sure that this one doesnt have 12V on it!. With a short piece of wire, ground PIN 33 wire you just spliced.

The EGR valve should open when PIN 33 is grounded. You should hear the engine wanting to stall. If it doesnt open, check the vacuum line at the EGR valve. Is it sucking ? If its not sucking the EVR is bad. If its sucking, but EGR does not open, EGR valve is bad. If the EGR valve does open, but you still get code 33, EVP sensor is bad.

phew, hope you understood, lol

I found this post on page 52 , I might try this as soon as I get enough money, I only have enough for one of these bigger priced items right now.

Aug 29, 2005 | 11:58 AM

#23

neoflee

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I found this article on page 52

Thanks everyone for your suggestions on this truck.
The sluggish, bogging down when hot turned out to be the PIP (pickup coil) in the distributor (that was the main part failing due to the heat) I haven't heard much about this one failing but I suppose so. Also, the TPS was replaced and the Intake Plenum gasket. I have my power back! now, to keep from gettting a speeding ticket......!

BobG