Ctgriffi Posted November 1, 2016 Share Posted November 1, 2016 I haven't had a chance to dig into this much yet, but I'm just looking for some likely problem areas. This 3.0 is in my 91 Warrior with 83K miles, which I've owned for two years. I do not know if the scheduled valve adjustment was ever done (but I doubt it). Last year, I did the T-belt, water pump, and installed new plugs and wireset, and it drove fine after that. Basically, the last few times I've taken it out, there's initially been a lot of "missing" and hesitation so that it's pretty difficult to get up to speed. Then, after awhile, things seem to improve. Last weekend, we drove for about 10 miles at around 40-50mph while the problem continued; then, I got on I-44 (crossing my fingers) and seemed to do pretty well after that—drove for the next hour at 65mph+ without much difficulty and no hesitation. What's this sound like to you? Quote Link to comment Share on other sites More sharing options...
fred heath Posted November 1, 2016 Share Posted November 1, 2016 You could have some bad gasoline, or water in the fuel. Lucas, makes a great gas treatment you just add to your tank. Will clean the injectors at the same time. Worth a shot. Quote Link to comment Share on other sites More sharing options...
linda s Posted November 1, 2016 Share Posted November 1, 2016 I always recommend a code check. Could find faulty oxygen sensor or other easily fixed things. Beyond that you really need to have those valves checked, adjusted. Burnt valve could definitely cause poor running. And then there's the head gasket. If it's never been done according to the special service campaign from Toyota it could be failing. Takes some coercion but they are still doing those for free. Info is here including vin numbers covered. http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0CEkQFjAA&url=http%3A%2F%2Ftoyotamotorhome.org%2Fforums%2Findex.php%3Fapp%3Dcore%26module%3Dattach%26section%3Dattach%26attach_id%3D3864&ei=pw0RUpfOBoagigLxtIDwCg&usg=AFQjCNEO5ZfE87ouQz6YEr8jnd6fX_0IRg&sig2=ou-jBMVhUlCd3_VgILtC3A You need to call Toyota customer service to see if yours has ever been done. Make sure you refer to it correctly. It is a Special Service campaign NOT a recall Linda S Quote Link to comment Share on other sites More sharing options...
Maineah Posted November 2, 2016 Share Posted November 2, 2016 The code system is pretty rudimentary and should set a check engine light if a code is stored but valves yes and a head gasket too. Quote Link to comment Share on other sites More sharing options...
DanAatTheCape Posted November 2, 2016 Share Posted November 2, 2016 is there a CEL? Could be a lot of things. How much has it been driven in the last year? Quote Link to comment Share on other sites More sharing options...
Ctgriffi Posted November 2, 2016 Author Share Posted November 2, 2016 Thanks, everyone. HG was done years ago as part of the special service campaign (I verified this w/Toyota before buying the Warrior). No CEL's on the dash. It hasn't been driven much in the last year because it was needing a major cabover repair. I did start it up and run it for 10-15min, every few weeks. I think I will do a fuel system cleaning with the 3M kit, which has worked well for me on other vehicles, and see if that helps at all. And, yes, I need to plan on the valve adjustment in the near future (did that job on my Celica's 5SFE a few years back, so I have some idea what's involved). Quote Link to comment Share on other sites More sharing options...
WME Posted November 2, 2016 Share Posted November 2, 2016 Newer fuel filter???? Quote Link to comment Share on other sites More sharing options...
RVdaytrader Posted November 2, 2016 Share Posted November 2, 2016 Google "3vze runs rough"... there are several groups with 4runners (same as your engine) on the net and you will see many suggestions. Quote Link to comment Share on other sites More sharing options...
DanAatTheCape Posted November 4, 2016 Share Posted November 4, 2016 one easy thing to check is the hose going to PCV valve. If it is disconnected, you will get some of the symptoms you describe - ask me how I know! LOL It is on the passenger side, about 2/3 of the way back underneath the edge of the plenum - pcv is in top of rocker arm cover, hose goes from plenum to PCV. It is hard to see let alone get your hands on. If I was there I would check it with my hand. If the hose is off and you put your finger over the end of the hose you should notice immediate improvement. Note that the disconnected hose scenario will have noise in that area too. Quote Link to comment Share on other sites More sharing options...
Ctgriffi Posted November 8, 2016 Author Share Posted November 8, 2016 (edited) Did some fuel system cleaning and cleaned the TB and throttle valve. Replaced fuel filter and also dist. cap and rotor (w/Toyota parts). Verified idle speed and timing. No improvement that I can see; still noticeable missing/hesitation under acceleration. Guess I'll doublecheck the PCV valve and hose too, like Dan mentioned (thanks!). Edited November 8, 2016 by Ctgriffi Quote Link to comment Share on other sites More sharing options...
Maineah Posted November 9, 2016 Share Posted November 9, 2016 Disconnect the vac hose to the EGR and see what happens. Quote Link to comment Share on other sites More sharing options...
Ctgriffi Posted November 14, 2016 Author Share Posted November 14, 2016 On 11/8/2016 at 6:46 PM, Maineah said: Disconnect the vac hose to the EGR and see what happens. Exactly right—EGR valve was causing all the trouble. I pulled it off and ended up making a steel plate to cap the opening on the plenum. Motor idles near perfect now, pulls strong and smooth up to highway speed with no hesitation. Good stuff, thank you, Maineah! Quote Link to comment Share on other sites More sharing options...
Maineah Posted November 14, 2016 Share Posted November 14, 2016 13 hours ago, Ctgriffi said: Exactly right—EGR valve was causing all the trouble. I pulled it off and ended up making a steel plate to cap the opening on the plenum. Motor idles near perfect now, pulls strong and smooth up to highway speed with no hesitation. Good stuff, thank you, Maineah! If you live in a state that emission tests it will flunk Nox but other than that is should have no effect. Quote Link to comment Share on other sites More sharing options...
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