Last post on May 02, 2013 at 7:16 AM
You are in the Isuzu Trooper
What is this discussion about?
Isuzu Trooper, SUV
#11270 of 11964 Re: Nearing 90K, some questions [seanreid]
May 02, 2006 (8:29 am)
I think the interference issue has been discussed a few times in years past. I don't remember your particular engine's intereference results, but a discussion search might get it for you. Timing belt replacement can also include water pump and timing belt tensioner replacement, little or no addicitional labor cost to change those parts while front of engine is open. Back when I had my 1995's timing belt changed the cost was around $450 including parts and labor. That's very low cost compared to other vehicles for a timing belt change. My 2001 will be due for a timing belt change in only 16K more miles.
My 2001 Trooper has had a lumpy idle as you describe, it was a faulty EGR valve, the port where the valve mounts must be scraped clean for a replacement to be most effective. EGR valve is a couple inches in diameter and hieght on the top of the engine at the fire wall end on the passenger side in the USA. Labor was about as much as the new EGR valve by my Isuzu specialist mechanic. I was told that if I let the EGR valve get worse eventually it would no idle at all.
I also had to replace the intake manifold gaskets since in the 2001 model year they tend to go bad after 80K miles, that was another few hundred dollars. While leaking air into the engine at the manifold gasket leak idle smoothness can be effected and dirt can be pulled into the engine.
I drive my Troopers the greater of 200K miles or 10 years, and I keep up with the maintenance so they keep running like new the whole way. 1984 Trooper new $11K, 1995 Trooper new $22K, 2001 Trooper 30K miles $13K, so $46K total for three Troopers with a combined 425K miles so far (the 1995 was rear ended and totalled at only 140K).
#11271 of 11964 Re: Nearing 90K, some questions [boxtrooper]
May 03, 2006 (5:49 pm)
I remember you. Thanks very much for the response. I'll have the EGR valve checked. Thanks very much.
#11272 of 11964 Re: 93 Trooper Where is ECM found? [idgopher]
May 07, 2006 (6:34 pm)
I am curious if you had the front end looked at and what the outcome was. I am currently looking at a 1994 Trooper S. Everything seems to be in good working order other than the very sloppy (lots of play), front end. Do you have any insight to this ?
#11273 of 11964 Front end sloppy
May 07, 2006 (6:40 pm)
I am looking at a 1994 Trooper S. It has 117,000 miles on it and is in good condition overall. The only apparent issue is the very sloppy front end , lots of play. The steering wheel does not line up straight either. Does anyone have any info that might help. Will this be costly to fix. I like the Trooper other than the steering problem.
#11274 of 11964 Re: Front end sloppy [kencobra]
May 08, 2006 (7:47 am)
The Trooper's steering wheel turns a shaft with a worm gear on the end that looks like screw threads. This worm gear meshes with another gear in the steering box. The depth of the worm gear into the steering gear is adjusted by a screw with a locking nut on top of the steering box. Play in the steering is greatly effected by the depth of the worm gear into the steering gear. The slop in the steering may be able to be corrected out with a simple adjustment.
However, consider the cause of the problem also. Ask when was the last time the power steering fluid was changed? If it never has been changed, you might only have to adjust the slop out and change the power steering fluid for a long service life. There is a chance that the steering box has to be replaced, from a junk yard part probably for a few hundred dollars installed I am guessing. Power steering fluid change required to take apart a hose fitting, the labor involved will make the bill from your mechanic $50 to $80 I am guessing.
Ask also has the steering wheel been removed and replaced? If so, why? That can cause the steering wheel not to be straight with the wheels.
#11275 of 11964 Re: Front end sloppy [kencobra]
May 08, 2006 (8:27 am)
Hi, I have a 94 Trooper and had the same issues when I bought it. I suggest you check the air pressure in the tires, condition of the tires (for signs of alignment problems, cupping, etc:) and finally wheel alignment. During an alignment, the steering wheel issue is addressed. Power steering fluid change is also recommended on a regular basis. If your steering is still too loose for your taste after this, then I would agree that the steering gear lash needs adjustment. Might be tough on the 94 due to age and rusting of the adjuster, but possible.
If you change out the steering gear, you will probably need to have it aligned again, but it is cheaper to do the alignment now and see if it helps than to just change the gear. I had an alignment and new tires done on mine and the difference was enough to make the steering much more satisfactory. Good luck.
#11276 of 11964 99 Trooper approaching 90K miles
May 09, 2006 (7:45 pm)
My experience with rough idle on this model is a need to use carb cleaner on the intake butterfly and air intake throat. I found that mine was really coated with carbon deposits from the EGR system. I did a thorough cleaning of these and the EGR tube going to the intake chamber and my idle smoothed right out. Additionally my mpg improved measurably.
In mixed driving short trips of about 6 miles, I'm getting 15 mpg and about 18.5 mph on the highway. My Trooper is about to roll over 91K miles. I think it runs as well now as it ever has.
Things I've done to improve MPG are well documented on this site in previous messages.
#11278 of 11964 Re: 99 Trooper approaching 90K miles [bsmart1]
May 25, 2006 (2:43 pm)
What is the process for cleaning the intake port? Other than carb cleaner, what should I use (brush, scraper)?
#11279 of 11964 Help Finding Electrical Harness Mod arc / plasma for Improving Gas Mileage
May 31, 2006 (6:16 am)
Last year I researched buying a used Trooper. My biggest concern is gas mileage. While researching this thread I stumbled on several folks who had reported very good results with a fairly expensive / exotic electrical harness / spark plug Modification. As I recall, the principal was straight forward, it provided a more complete "burn" and the result was 10-20% improved fuel economy. It was not cheap however.
For the life of me, I can't find the referenced in this thread.
Can someone help me out? Does this sound familiar to anyone?
If it helps, the spark plugs with very custom, plasma / arc technology and you had to buy these from the company that manuf. the harness / system.