Question about 2004 Nissan Quest

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04 Quest SL

Dear Experts,
I need your opinion, fast. In early August, I took my family to Sequoia Nat'l Park. I was approx 15 min inside the park from the park entrance, my Q's idling became rough and as I was pulling into the parking space, motor stopped. Waited for 3 hrs for towing and towed to Pep Boys in Visalia. Pep Boys stated there was no power at injection. They suspected that computer somehow turned anti-theft system on. So, I towed to Visalia of Nissan. Here is their findings. "Found that van has not fuel or spark Checked ECM and it working ok checked cam sensors and crank sensor it was working normal allso checked compresson and found it was low in all cylinders Called Nissan Tech Line They told me to check timing chains Found that timing jumped cand car is out of timing and it going to need new engine due to low engine compression $6500.00 to replace engine...Customer declined." So, I towed my Q to local mechanic. There he found problems in ECM, Cam Pos sensors, and couple of coils. No problems w/ compression. He thus, ordered ECM (over 1 mo and the dealer has not received it yet), and he replaced x3 coils and x2 cam sensors. He also found used ECM from Oregon and put the ECM and took my Q to the local dealer for re-programing. At the dealer, they were able to start the motor, however, idling remains rough and will not go any more 800 rpm or 5 mph. Per dealer, my Q is not fully functional since last two digits of the ECM is different from the original ECM. My friend also suggested that dealers don't stock ECM's since it is very rare for the ECM to go wrong. That's why it is taking over a month to get it. So, he does not think ECM problems, but, something else is bad. Does any of you have any ideas what went wrong w/ my Q? Should I put the original ECM back and take Q to the good mechanic? Do you know a good mechanic I can trust in Monterey, CA?

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  • soochan Nov 01, 2008

    Dear Guru,
    I appreciate your comments. My van is to the point running great. To make long story short, I had to spend $5,000 to put this van on the road again. Things done on my van, 1. Installed brand new ECM (done by a local dealer), 2. Changed 5 out of 6 coils (x3 at local dealer and x2 at indep repair shop), 3. Replaced brand new rear catalytic converter (indep repair shop), 4. Replaced oil pressure sending unit (myself), Replaced "O" ring at oil cooler (myself), 5. Replaced lower oil pan gasket (myself). I'm taking this dealer to a small claims court for misdiagnosing of the problem (nothing to do w/ timing jump) and did not have to replace motor (nothing wrong w/ motor or injection systems). The mechanic replaced rear cat said that inside the cat was broken in small pieces and when he removed it, he saw approx 30% of contents remained inside the cat and 70% aided in clogging up the exhaust pipe and main muffler. This created tremendous amount of heat and may have caused malfunction of coils that lead to malfunction of ECM and oil leak from oil pressure switch, oil cooler, and lower oil pan. Dealer wanted $1,815 to replace rear cat and exhaust manifold (nothing wrong w/ ex manifold, cost me $1,400 for parts and labor), $750 for oil cooler replacement when I only needed "O" ring replacement ($2.42), $520 for Mass Air Flow Sensor replacement, I replaced sensor part for $50, $140 to replace oil pressure sending unit, bought this switch for $12.91. And, $168 to replace Lower oil pan gasket, I bought RTV at local Kragen for $8. Main thing is when the dealer identified that there was something wrong w/ rear cat since there was audible exhaust leak noise. I asked the service manager that if cat was clogged up. She said, 'No". Cat was not clogged up (majority of contents were gone), but the exhaust pipe and main muffler were clogged up pretty badly. If you were me, would you still take your van to the dealer and have them repair parts not even damaged or would you take the van to someone that you can rely on? I'll keep you posted w/ taking this dealer for small claims court. Wish me a luck!



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Let me get this straight, you took your Nissan to the NISSAN dealer (who has extensive data and resources) and they said you needed an engine due to the timing had jumped and you declined due to the $6500.00 price. So you took it to the independent guy (local mechanic) that is guessing and throwing parts at it and most likely making it worse because you only needed an ECM that the dealer said was ok, 2 cam sensors and 3 coils (but hey its cheaper than an engine). So now you have a used ECM that doesn't belong in the vehicle that you most likely didn't need and are awaiting the correct one from Nissan. You now have or will have 3 working ECMs, 4 good cam sensors and nine good coils in a van that will still not run. Ok and now you think that the independent guy (local mechanic) doesn't know what he's doing and you want to know if anybody knows a good mechanic. Whatever gave you that impression?? I know now what the problem's you. You tried to save money but it didn't work. Hopefully you didn't do any further damage but who knows. Get your money back from the local mechanic and take your van to the dealer to get the engine you need before someone else takes you for a ride or damages your vehicle further.

Posted on Sep 16, 2008


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