LIM + lifters

[sverker]

Is there anything that require access from under the engine on this job? I won't have access to lift, but I could use ramps.

[lesterl]

Changing the Oil when done.....

[sverker]

Yes, definitly...

I've made the order to rockauto now, will be interesting to see how long time it takes to ship but other peoples experience is that rockauto is faster to get the parts to Sweden than the local dealer is to deliver...

[sverker]

Hi again,
I've finally got started on doing this job. In another thread I described that I got an oil leak (http://www.automotiveforums.com/vbul....php?p=6886466), haven't driven it since except for moving it from one parkinglot to another recently (roughly 200 meters). When I parked it I checked the oil and this time it was clear that there was water in the oil so the LIM gasket had finaly broken.

Tonight I've been taking the engine apart to get to the LIM which took roughly 4 hours taking it slow and marking all cables and hosed. All went fine, except for one incident:



One of the bolts for the thermostat had stuck in the gradients and cracked it . What do you suggest, repare it (weld up new material and drill a new hole which is difficult but not impossible on aluminium) or try to find a new LIM at the junk yard?

I also saw a strange thing:


This box is connected to the harness that goes to the injectors. I'm pretty sure it's purpose is to lengthen the injector is open to allow the engine to run on E85 (85% ethanol, 15% gasoline). That must have been installed by previous owner and not from factory? There is a jumper cable behind the box, I think that should have gone to a switch on the dashboard to switch on/off E85 mode, but maybe the injector controler is able to regulate it anyway.

[lesterl]

Pix are WAYYYYY to large.......

New LIM from a J/Y.......

Could be a propane controller? IDK

[sverker]

Pictures re-scaled to a more sane size..

We have an online system for the junk yards where they list the parts, the problem is that there is no category for the intake and none list it neither in the misc category. There are plenty of other parts from these engines so they have taken apart severals.

I'm trying to find the part number of the intake, to be able to find also if there are other engines that have the same intake. As I understand it that part was changed sometime mid -99, the laters doesn't have hole for temperature sensor in the thermostat house and slightly different channels for the coolant.

Regarding the device (multiport injector interceptor), I've mailed to the manufacturer but I'm quite sure it's related to runnign on ethanol, since propane (also called LPG here) require other hardware as well.

[sverker]

Hi again,
I've now driven roughly 70 miles after the LIM gasket change and so far I have not seen that it's loosing coolant and the oil looks good. Neither has any mechanical rattling developed.

Today I went to do the mandatory yearly check which also includes emission tests. They do the test at idling and at 2500 rpm to check various parameters, it got too high values on CO and HC on idling. CO was 1.5% (allowed 0.5&), HC was 367 ppm (allowed 100 ppm). Also CO at 2500 rpm was just at the limit 0.3%. The lambda value was 1.01 (which is a calculated value, not actually measured). As earlier mentioned the ODB reading gives code P0134 which is that the front O2 sensor is not working so I was not very supprised. The rear shock absorbers were also bad, which I had been feeling. The air lines was completly dried out and broken so I'll give it a try to replace them which has to be done anyway.

When driving to the test center I felt at speeds between roughly 90 and 100 km/h (approx 55 - 60 mph) some shoudering. It was like driving on a too high gear, I've felt it before when driving last summer at some occations. I then spontaneously diagnosed it as a tranny / torque converter issue and searching the forum today I find that it might be true as people describe that symptom when the torque converter lookup is malfunctioning. The tranny is shifting gears smothly, no hard shifting has been noticed. Accelerating up to 110 km/h removed the shoudering at that time. It was more of a feeling, the rpm of the tachometer did not fluctuate.

After finishing the tests and driving from the center I saw the temperature gauge reading higher than usual, it's usually at the middle at 100 degrees and now it was at 2/3, and the fans still didn't run. I verified yesterday that the fans themselves and their relays work fine. After driving for a few minutes the temperature had returned to the norma. When searching the forum I find that this might not be a fault after all as the temperature might not have been high enough for the fans to kick in.

When driving back it was raining and very humid. Then I experienced shoudering also at lower speeds, and it was very prone to stalling when releasing the accelerator to slow down at red lights. It's hard to tell if it was the torque converter lockup causing the problems, at some times it felt like that, or if it is sensitive to humidity for some reason. I plugged in my bluetooth ODB-II adapter but no new codes had been recorded. When I came home I let it idle for a while, maybe it was slightly uneven but very little and it couldn't be seen on the tachometer. At a short drive tonight when it's not raining I didn't feel any uneven operation.

The plan for next steps are as follows:

* There is a hose from the back valve cover to the air intake which is not perfectly seated in the valve cover. It's darn hard to reach but it will need to get in place properly. The engine would suck air that way otherwise.

* Verify that there are no vacuum leeks.

* Clean the MAF sensor, I read here on the forum that it may sometimes cause the O2 sensor code to appear. Doesn't hurt to try it.

* If the above doesn't solve the issue then change the O2 sensor. Spark plugs and wires are new, the old plugs looked normal so the high HC value is not caused by oil leaking into the cylinder (which also would cause it to be smoking).

* Check the actual engine temperature through ODB-II, to see if it becomes hot enough for the fans to kick in. I'm not sure if I can use the AC trick to make them start as my system is completly depresurized. If the engine do become hot enough then verify the wires to the PCM.

Btw, as it looks on the electrical circuit drawings it seems the PCM outputs are pull down. I.e. they operate by pulling the signal to the ground and doesn't have an active pull up. Is this true? If so then the signals can be externaly grounded to test the function without risking to fry the PCM.

* Change filter and fluid in the tranny, it's due anyway. Mine should be an 4T60-E if I understand correctly. As I understand the solution is to change the TCC solenoid and torque converter seal but that the tranny would have to be dropped to do that. The latter is not a major obstactle, a good friend of mine runs a workshop which among other things does automatic transmissions.

Any other suggestions to investigate for the above described symptoms? Idle air control valve? Air intake temperature sensor? MAP sensor? Fuel filter?

[lesterl]

Originally Posted by sverker

Hi again,
I've now driven roughly 70 miles after the LIM gasket change and so far I have not seen that it's loosing coolant and the oil looks good. Neither has any mechanical rattling developed.

Today I went to do the mandatory yearly check which also includes emission tests. They do the test at idling and at 2500 rpm to check various parameters, it got too high values on CO and HC on idling. CO was 1.5% (allowed 0.5&), HC was 367 ppm (allowed 100 ppm). Also CO at 2500 rpm was just at the limit 0.3%. The lambda value was 1.01 (which is a calculated value, not actually measured). As earlier mentioned the ODB reading gives code P0134 which is that the front O2 sensor is not working so I was not very supprised. The rear shock absorbers were also bad, which I had been feeling. The air lines was completly dried out and broken so I'll give it a try to replace them which has to be done anyway.

When driving to the test center I felt at speeds between roughly 90 and 100 km/h (approx 55 - 60 mph) some shoudering. It was like driving on a too high gear, I've felt it before when driving last summer at some occations. I then spontaneously diagnosed it as a tranny / torque converter issue and searching the forum today I find that it might be true as people describe that symptom when the torque converter lookup is malfunctioning. The tranny is shifting gears smothly, no hard shifting has been noticed. Accelerating up to 110 km/h removed the shoudering at that time. It was more of a feeling, the rpm of the tachometer did not fluctuate.

After finishing the tests and driving from the center I saw the temperature gauge reading higher than usual, it's usually at the middle at 100 degrees and now it was at 2/3, and the fans still didn't run. I verified yesterday that the fans themselves and their relays work fine. After driving for a few minutes the temperature had returned to the norma. When searching the forum I find that this might not be a fault after all as the temperature might not have been high enough for the fans to kick in.

When driving back it was raining and very humid. Then I experienced shoudering also at lower speeds, and it was very prone to stalling when releasing the accelerator to slow down at red lights. It's hard to tell if it was the torque converter lockup causing the problems, at some times it felt like that, or if it is sensitive to humidity for some reason. I plugged in my bluetooth ODB-II adapter but no new codes had been recorded. When I came home I let it idle for a while, maybe it was slightly uneven but very little and it couldn't be seen on the tachometer. At a short drive tonight when it's not raining I didn't feel any uneven operation.

The plan for next steps are as follows:

* There is a hose from the back valve cover to the air intake which is not perfectly seated in the valve cover. It's darn hard to reach but it will need to get in place properly. The engine would suck air that way otherwise.

Definitely.

* Verify that there are no vacuum leeks.

Definitely.

* Clean the MAF sensor, I read here on the forum that it may sometimes cause the O2 sensor code to appear. Doesn't hurt to try it.

Wouldnt Hurt.

* If the above doesn't solve the issue then change the O2 sensor. Spark plugs and wires are new, the old plugs looked normal so the high HC value is not caused by oil leaking into the cylinder (which also would cause it to be smoking).

What brand of spark plugs? I did some Bosch, junk, ended up with some NGK's and it runs very smooth now. Might need to clean the sensor.......

* Check the actual engine temperature through ODB-II, to see if it becomes hot enough for the fans to kick in. I'm not sure if I can use the AC trick to make them start as my system is completly depresurized. If the engine do become hot enough then verify the wires to the PCM.

Fans kick in at around 235* on mine (3/4 scale).... Comes on sooner with AC on IIRC.......

Btw, as it looks on the electrical circuit drawings it seems the PCM outputs are pull down. I.e. they operate by pulling the signal to the ground and doesn't have an active pull up. Is this true? If so then the signals can be externaly grounded to test the function without risking to fry the PCM.

AFAIK that is correct......

* Change filter and fluid in the tranny, it's due anyway. Mine should be an 4T60-E if I understand correctly. As I understand the solution is to change the TCC solenoid and torque converter seal but that the tranny would have to be dropped to do that. The latter is not a major obstactle, a good friend of mine runs a workshop which among other things does automatic transmissions.

Yup 4T60e, same as mine (97 Venture), might have a worn valve body also.......

Any other suggestions to investigate for the above described symptoms? Idle air control valve? Air intake temperature sensor? MAP sensor? Fuel filter?

Doubt it, Doubt it, Doubt it, You havent changed the fuel filter lately?

[sverker]

* If the above doesn't solve the issue then change the O2 sensor. Spark plugs and wires are new, the old plugs looked normal so the high HC value is not caused by oil leaking into the cylinder (which also would cause it to be smoking).

What brand of spark plugs? I did some Bosch, junk, ended up with some NGK's and it runs very smooth now. Might need to clean the sensor.......

I see on the list from Rockauto that the new spark plugs that I ordered are Champion. The wire set are from Standard Motor Products

* Check the actual engine temperature through ODB-II, to see if it becomes hot enough for the fans to kick in. I'm not sure if I can use the AC trick to make them start as my system is completly depresurized. If the engine do become hot enough then verify the wires to the PCM.

Fans kick in at around 235* on mine (3/4 scale).... Comes on sooner with AC on IIRC.......

When driving in the city today the temperature gauge came up to about 3/4 so I was getting worried but then I could see it was moving down again to about 1/2 so the fans must have started. I couldn't stop in middle of traffic to verify it visually though.

Any other suggestions to investigate for the above described symptoms? Idle air control valve? Air intake temperature sensor? MAP sensor? Fuel filter?

Doubt it, Doubt it, Doubt it, You havent changed the fuel filter lately?

I haven't changed the fuel filter at all, so it's definitly something to put on the todo list.

Today the engined stalled on several occations when driving in the city, always when releasing the accelerator to slow down to a red light. It didn't help to put the gear in neutral, the tachometer started to move up and down like it almost died then came back and died again. By manually keeping a slightly higher idle rpm with the accelerator I could keep it from dying.

That rules out that this problem is related to the torque converter as it occured even if the gear was in N. Neither was it raining today so humidity is not a factor. It only happens on warm engine, the temp gauge was between 1/2 and 3/4.

[lesterl]

Check the fuel pressure, change the filter, check again. Might check/ clean the IAC valve as well as the EGR, the EGR not closing off after a slow down could cause your issue, or perhaps unplug it before you start it so it stays closed (will set a light sooner or later.)