Hi,After searching the web for a decent Infiniti J30T forum, I chanced upon this great website.I own a 1993 J30T with 265K on it. The car has been running very well with a couple of major repairs. I have owned it for 3 years and driven about 90K.Had very little service of the car when I purchased it. Have tried to keep well maintained. Recently though, I have benn having some problems. It started 3-4 weeks back. Used to be intermittent but then became pretty regular. While driving, the engine would turn off sometimes. Used to happen on low RPM's (when stopped at red lights or driving in a traffic jam) and only when it was humid but it developed into a major problem where it didn't really matter what the weather was like.The car wouldn't start once it lost power. There was a lot of hesitation when it did start up and if u gave it some gas, there were black fumer coming out of the tail pipe(serious black fumes) and the car would vibrate. If you kept at it (let it idle while in park with hesitation) the engine would rev up on its own in a couple of minutes. If you put it in drive, sometimes the car would be ok and sometimes it would lose power again.I finally took it to a mechanic (the first one I encountered) and the guy said that the timing belt might need replacement. The car was giving problems just starting up now so I told him to go ahead. The car seems fine now but I have been trying to do research on the problem and I can't say I have seen any of the posts with a problem like mine. Just wondering if the shop "took mefor a drive" or could a problem like this be related to the timing belt issue. I haven't replaced the timing belt since I have had it.I know this is a long read but hopefully I can get some answers since this site seems to have a lot of J30T specialists.
Thanks again for all the help.Cheers
Timing Belt Change
Welcome to nico:)
So your saying the car run poorly but after they replaced your T-belt It fixed your run problem? That seems a bit odd but theoretically if it jumped time it would run poorly. Typically though when they jump time they tag valves and a T-belt wont fix that problem. I would say by your description of the problem it was an airflow meter. If your timing had skipped one tooth it would lack power on accel and have a poor idle. I just dont know if the T-belt was the actual problem. Perhaps during the R&R of the belt they inadvertantly fixed a connection problem to another component like the coolant temp sensor or airflow meter.
By the way your car, drivetrain wise, is more like a 300z rather then a max or I30.
So your saying the car run poorly but after they replaced your T-belt It fixed your run problem? That seems a bit odd but theoretically if it jumped time it would run poorly. Typically though when they jump time they tag valves and a T-belt wont fix that problem. I would say by your description of the problem it was an airflow meter. If your timing had skipped one tooth it would lack power on accel and have a poor idle. I just dont know if the T-belt was the actual problem. Perhaps during the R&R of the belt they inadvertantly fixed a connection problem to another component like the coolant temp sensor or airflow meter.
By the way your car, drivetrain wise, is more like a 300z rather then a max or I30.
Hi,
Thanks for the quick response. There was definite hesitation during acceleration and the engine wasn't responding as it usually does when u give it gas. Just the fact that as soon as I took the car to the shop, they tried to start it up and after a few minutes this is the first thing they sais, that the car needs a new timing belt. I just can't figure out what corelation the loss of power has with the timing belt.
Cheers
Thanks for the quick response. There was definite hesitation during acceleration and the engine wasn't responding as it usually does when u give it gas. Just the fact that as soon as I took the car to the shop, they tried to start it up and after a few minutes this is the first thing they sais, that the car needs a new timing belt. I just can't figure out what corelation the loss of power has with the timing belt.
Cheers
Would this also result in the car vibrating while the engine is still skipping and trying to get back in rhythym because after the power loss on most of these occasions when I started the car again the engine would skip and the car would vibrate a lot. Everything would come back to normal after a few minutes when the engine would rev upto 2000rpm and then settle into idle at about 800-1000 rpm. Most of the times this problem would happen while waiting at red lights or while drving at extremely low speeds (10-25 km/hr).
If it were a timing issue the problem would not subside at idle, if it was the timing the charicteristics would not come and go at a specific rpm. At that rpm the symptom would always be there. You either had a coolant temp sensor problem or airflow meter problem causing it to load up on fuel. Once you rasied the rpm it would clear out the excess fuel then once it reached idle again it would idle ok till it started fouling out the plugs again.
Re: Timing Belt Change
Everything you are describing sounds like a bad CPS Crankshaft position sensorvishal wrote:Hi,After searching the web for a decent Infiniti J30T forum, I chanced upon this great website.I own a 1993 J30T with 265K on it. The car has been running very well with a couple of major repairs. I have owned it for 3 years and driven about 90K.Had very little service of the car when I purchased it. Have tried to keep well maintained. Recently though, I have benn having some problems. It started 3-4 weeks back. Used to be intermittent but then became pretty regular. While driving, the engine would turn off sometimes. Used to happen on low RPM's (when stopped at red lights or driving in a traffic jam) and only when it was humid but it developed into a major problem where it didn't really matter what the weather was like.The car wouldn't start once it lost power. There was a lot of hesitation when it did start up and if u gave it some gas, there were black fumer coming out of the tail pipe(serious black fumes) and the car would vibrate. If you kept at it (let it idle while in park with hesitation) the engine would rev up on its own in a couple of minutes. If you put it in drive, sometimes the car would be ok and sometimes it would lose power again.I finally took it to a mechanic (the first one I encountered) and the guy said that the timing belt might need replacement. The car was giving problems just starting up now so I told him to go ahead. The car seems fine now but I have been trying to do research on the problem and I can't say I have seen any of the posts with a problem like mine. Just wondering if the shop "took mefor a drive" or could a problem like this be related to the timing belt issue. I haven't replaced the timing belt since I have had it.I know this is a long read but hopefully I can get some answers since this site seems to have a lot of J30T specialists.
Thanks again for all the help.Cheers
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