Trans Sport :: 3.1L V6 - Misfires / Hesitation And Lack Of Power When Hot
Jun 3, 2014
Here is one of the nicest-running van we ever had with a 3.1L V6 TBI Chevrolet engine that always ran too good to be true.
Few days ago it developed a misfire condition that is very pronounced when the engine is hot/at operating temperature - under load it hesitates like it's running in 4 cylinders out of 6. When cold it starts right away and runs good & smooth.
Now the van can't go anywhere - it misfires so severely that the engine stalls and dies at idle.
What we tried so far, to no effect, was:
- changing the spark plugs & wires
- replace the distributor cap & rotor
- replaced the EGR valve
- replaced the IAC valve
- replaced the MAP sensor
We had a lot of 3.1L Chevy TBI engines and none ran so smooth like this one and, all of a sudden, none ran that bad in such a short time...
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So woke up this morning take kid to school, got about 1-2 miles from home and engine light came on and had to switch to tiptronic because seemed the engine was struggling to move the car and downshift and was able to drive somewhat fine. but at stop signs the car idle and shook slightly then taking off was a bear because it lacked power. I did notice my mpg was reading bout 10-15mpg less then normally.
I going back to bed because I work graveyard and will look at it more when I get up. but the oil looked good and wasn't any engine burning smell. the only odor i think i could smell was almost like coolant. What could be causing this?
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I have a 2007 LS 460 with about 50,000 miles. Some 18 months ago, at about 35,000 miles,right after a service, I began to experience hesitation/lack of power when accelerating from a stop. Lexus fixed this by doing a software update to the transmission.
All was well till last month, when again right after a service, the car hesitated and totally lacked power , most noticeable from a rolling stop. Revs would very gradually climb to 5,000, with foot flat on accelerator, yet car barely moving. Once speed built up to highway speeds, car reacted normally. Took it back to Park Place Lexus who held the car for 10 days and did a major job changing the cylinder head, I think per L-SB-0033-08.
A month later, the hesitation/lack of power is even worse then before! I suspect the issue is the transmission, and the big surgery on the engine done last month was not required. After nearly being hit trying to merge with traffic today, the vehicle is back at the dealership, and I took their head tech for a drive. He experienced the problem, but did not venture a solution. He told me they take instructions on what to do directly from Lexus.
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If I press the gas a little hard in drive, my tires squeal but if I'm in reverse I can feel a slipping in the trans. If I try to back a trailer up an inclined driveway, it won't go, the trans slips. I have no crud in the pan. I've replaced the reverse boost valve. I installed a Trans-Go kit which is suppose to eliminate the reverse slip but it hasn't worked. Everything else works just fine and my fluid is red. I have engine braking in 2nd and 1st. The van backs up fine, it just does this in reverse under load.
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My Haynes manual indicates that the ELC exhausts air when the key is off. Is it intended to exhaust all air from the shocks every time I stop? It doesn't make sense to lower the vehicle every time I stop for fuel etc. With over 200k miles on this can it's amazing that the compressor still works.
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I am working on my daughter's TS, it has been overheating. Water pump is fine and the thermostat is working fine also. I did notice that the temp gauge on the dash isn't. I have noticed that the fan isn't coming on either. I don't have a book on this car or a owners manual. So I am unsure of which fuses to check. I did try turning on the AC to MAX to see if that would start a fan, and that didn't work either.
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I replaced my '94 TS intake plenum and upper and lower intake gaskets last year, and as part of the procedure I replaced the badly-degraded rubber gaskets that go at both ends of the manifold (at both ends of the "V", one under the throttle body, one under the PCV valve or so).
A little more than one month ago I realized the oil puddle underneath the car contained -besides power steering fluid from a known leak- motor oil. When I investigated the origin of the leak, I discovered the <> rubber gaskets have disintegrated AGAIN.
I don't see how this gaskets could be installed incorrectly, so I have to conclude the gaskets that came with the kit I used (Felpro?) did not withstand the oil as they should. Either way, I need to replace those <> pieces of rubber again
Now: since I don't want to be doing the same thing every 5 k miles, any good brand for these gaskets? Is there a material (neoprene?) that would last longer in contact with the oil?
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My 95 TS 3.8L is misfiring on #4cyl ONLY when reverse is applied. When car is in reverse with parking brake applied, consistently misfires on #4. In drive with brake applied and engine load no miss. Neutral no miss.
Car drive ability is great in drive no misfires. 100% misfires on #4 only when in reverse. Is there any vacuum change or assist utilized with this trans? Possibly vacuum leak? I do not have a vacuum gauge. I changed to a different plug wire and same problem. New plugs installed. Have not swapped coils yet.
I am not familiar with this trans, other than the vacuum servo for upshifting I replaced when it was sucking up trans fluid like my old Powerglide in the OLD days.
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These super-hot days our TS had started to develop a very strange problem:
- when you first start the engine the A/C works normally and cold air blows from the front vents on A/C or MAX as usual
- if we shut-down the engine and try to engage A/C or MAX again the cold air would only come-out through the top (windshield) and low vents - no more front ventilation
- all solenoids appear to be working (moving)
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Just recently the CEL started acting...first, would come ON then after some time would shut off....but now it is ON and stable. I was almost sure it had to do with EGR....checked codes and indeed, 55 , large EGR port failure and, accordingly, 56, QUAD driver faulty voltage...obviously because of large EGR port solenoid control. I have not verified the EGR coils yet....will come back later as I'm going out for 2 days.... This is a rather new EGR valve...6 or 7 year old.....and in fact, no more than 25000 miles...probably less...
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Our 95 TS 3.8 runs hot. I dislike the 195 Thermostat, but winter is coming. Temps can soar to 230 on gauge, with no air.(Now I remember why I had a 180degree thermostat).
I recently replaced a rebuilt delco starter that was about a year old.(faulty solenoid). I cannot recall if the Slow crank problem was there prior. When 230 degrees, intermittently I get a slow crank with dimming of dashboard lights, but bright headlights.
1. I know that the temps are supposed to swing a lot with this vehicle, but 75 degree days, 230 degrees when in heavy traffic is pushing it.(gauge). Is this normal for 195 thermostat?
2. Possible bad windings on new rebuilt starter? Armature drawing excessive amps when hot? Battery cables look okay, but original.
3. Considering a NEW starter and a heat reflector wrap for starter. New battery cables-thicker cable if possible(used welding cable for my old 421S.D.
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My 92 transport 3.1L had started quitting on me while driving. After sitting for about 15mins I could get it started and then continue on driving. Now its doing it more and I can't take the chance of going anywhere in it.
Got a CEL so I flashed codes 34, and 45. Where to start troubleshooting with what these codes are saying that I should do?
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I've replaced the drain plug, filled up the radiator with proper coolant/antifreeze, turned on the engine then closed the cap to see the needle going fast to near the red mark. I turned off the engine and touched the cap with my finger but it was cold so I did the same with a hose, not hot.
Well, it seems the problem was not all circuit was filled. I did add more after a while running and now it is working normally (knock wood).
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From time to time, the first time the car is started in a day, the transmission (4T60E, 1993) may take several ............ seconds before first engagement, either in forward or reverse. Fluid level OK, color OK, filter changed 2/3 years ago. This began just a few months ago. After that, everything will work flawlessly for all the day , no problem at all, all shifts OK, all subsequent starts OK.
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I have a 95 Lumina APV 3.8 and have vibration coming from the puller fan (passenger side front of radiator). Inspection shows fan and motor good, the rubber mounting grommets are hard as nails.
Is there a secret source for these parts?
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I had an intermittent heater blower problem for a few years. Yesterday it turned into a full time heater blower problem. I unplugged the connector to the fan motor, and ran a power feed and ground to the fan motor terminals. It blows strong! I located the low speed relay under the glove box. I switched it with the adjacent horn relay, like was suggested. No go! What else can it be?
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My son sent me a text stating "mom is driving with the steering wheel at 90 degrees to the left!". I had to get this repaired ASAP. I thought maybe a tie rod went bad and maybe went further. Steering had been off slightly to left prior.
Firestone said that when they went to check alignment, they found that the strut tower was gone. I knew it had to be on the right side. The passenger strut tower rusted through at the mid rear, and broke the spot welds, and was not attached at most of its circumference. Fortunately, the body shop that repaired our van from a prior damage.(hit at stoplight). I replaced the struts about a year or two ago with quick struts. Did not even think of checking for this rusting issue.
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Well, just picked the truck up from the dealer. Had to pay for the shudder diagnosis which turned up a #8 misfire as well as lesser random misfires on the mode 6 test (no CEL) since it out of B2B warranty. Also brought up the transmission issue I have been having. Virtually every morning when I go to pull out of the driveway, when I put the truck in park it was quite violently slamming into gear, even if I let it idle long enough to drop the neutral RPM's.
Service writer was a bit baffled, but after touching base with their driveline technician, and verifying it was in no way similar to how any other F150 engages they were able to locate TSB 11-11-11 which, to me, seems primarily concerned with the harsh 1-2 and 2-3 shifting but also noted the harsh engagement.
Anyways, they squeezed me in over night and in 2 days had my parts in and installed (apparently on these trucks they have to physically get the numbers off the solenoids to be replaced as there are a couple options). 3 solenoids tested bad and were replaced under the powertrain warranty. Truck did not slam when I picked it up, looking forward to testing tomorrow morning!
The best part is that when the tech went to drive the truck in this morning to start working it not only slammed into gear for him (verifying my concern) but it also demonstrated the violent 1-2 upshift. Too bad they couldn't push a spark plug through warranty, guess I'll have to wait for my Rockauto order to come in
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1993 TransSport 3.8: Where the heck is the oil pressure sending unit, and what is the best way to access it? What size of OPSU socket does it take; 1", 1 & 1/16", or 1 & 3/16". Do I need the 3/8" or 1/2" drive; extra deep or other wise? The van has a gauge on the dash.
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I have a 98 i just took it up on a trade. The sliding door on passengers side its automatic it wont open i hear something clicking but its not going. Other problem is the windshield wipers only work on high...
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Last week, the engine stopped twice in the 2 minutes after initial start....but then managed to take me back home. Was away for 1 week (not with TS) then when back , tried to start ...no joy.
This duplicates a similar event 8 years ago...solved with the ignition module being replaced.
[URL] .....
NO codes.
There are 2 options: crank sensor or ignition module. Will go for some tests and will report.
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