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4Crawler · 05-01-2008, 10:19 PM

The Factory Service Manual has the EGR testing procedures in it. See if the EGR is opening by manually applying vacuum at idle, should make engine run rough or even kill the engine. The EGR may also be caked with carbon inside, coating the temp sender so that it does not get hot enough to satisfy the ECU.

A buddy of mine had that same problem and ended up getting a new EGR valve and swapping out the old one ('94 pickup). Since it needed to get smogged (in CA), he could not have the CEL coming on at random.

05-01-2008, 10:19 PM	#20 (permalink)
4Crawler Contributing Member Join Date: Jun 2002 Location: SF Bay Area, CA Posts: 6,204	The Factory Service Manual has the EGR testing procedures in it. See if the EGR is opening by manually applying vacuum at idle, should make engine run rough or even kill the engine. The EGR may also be caked with carbon inside, coating the temp sender so that it does not get hot enough to satisfy the ECU. A buddy of mine had that same problem and ended up getting a new EGR valve and swapping out the old one ('94 pickup). Since it needed to get smogged (in CA), he could not have the CEL coming on at random. __________________ 1985 Toyota 4Runner SR-5, 22REC engine, dual t-cases, 4.88 gears, dual ARBs, 33x10.50 BFGs. r.c.brown@ieee.org TruckEditor@tlca.org Project: 4Crawler 4Crawler OffRoad Gettin'Off 4WD Club Last edited by 4Crawler : 05-01-2008 at 10:21 PM.